Marco Rubio visits Rome to resolve US tensions with Pope Leo and Italy

Trump’s Broadside and the Unraveling of a Key Alliance

President Trump’s public criticism of Pope Leo’s stance on Iran—and his subsequent remarks targeting Italian Prime Minister Giorgia Meloni—has strained a long-standing U.S. alliance. In April, Trump accused Meloni of lacking “courage” for opposing U.S.-led strikes on Iran, a position that prompted a strong response from Rome. Meloni’s government has emphasized that military action against Iran would violate international norms, creating a direct policy divergence with the White House. The immediate fallout included Trump’s threat to withdraw U.S. forces from Italy, which would affect nearly 13,000 service members stationed there amid regional instability.

The Vatican has maintained a measured but firm stance, with Pope Leo expressing repeated concerns about the U.S.-Israeli approach to Iran, though without explicitly framing it as a legal violation. Trump’s subsequent remark—hurting the Catholic Church!—was widely interpreted as a broader challenge to the Vatican’s influence, rather than a purely political statement. The situation has created a stalemate: the U.S. faces isolation, Italy navigates competing pressures between its NATO obligations and domestic political considerations, and the Vatican shows no sign of backing down from its diplomatic position.

Rubio’s upcoming visit—scheduled for May 7—represents the administration’s first effort to improve relations after the public dispute. Analysts describe the challenge as complex, not because it is impossible, but because it requires addressing deep-seated policy disagreements while repairing damaged trust. The core question remains whether the White House can regain European confidence in U.S. leadership when its own communications have undermined key partnerships.

A Diplomatic Tightrope: Meloni’s Balancing Act

Italian Prime Minister Giorgia Meloni faces a delicate position, caught between Italy’s strong Catholic heritage and its role as a NATO ally. While Rome has historically aligned with Vatican principles, Meloni’s government has also faced criticism from Brussels for its cautious approach to EU sanctions against Russia—a stance that has drawn opposition from both Washington and Berlin. Now, with Trump threatening to reduce U.S. troop levels in Italy, Meloni must determine how to respond without further straining relations with the U.S. or abandoning her skepticism of the Iran military campaign.

The strategic importance of Italy’s hosting of nearly 13,000 U.S. troops cannot be overstated—it represents one of America’s largest military presences in Europe. A full withdrawal would not only weaken NATO’s southern flank but could also signal to other European allies that the U.S. is no longer a dependable partner. However, Meloni’s decision not to immediately schedule a meeting with Rubio suggests she remains hesitant to fully accommodate Washington’s demands. Trump’s recent remarks—We have not been of any help to you, and Spain has been horrible—framed the troop threat as a matter of reciprocity, but Italian officials argue their contributions to maritime security and counterterrorism efforts have been substantial, even if they differ on Iran policy.

For more on this story, see Secretary of State Marco Rubio to Visit India in May.

The Pentagon’s recent announcement of a 5,000-troop reduction from Germany, justified as a response to criticism of U.S. policy, has further heightened concerns. Experts warn that if Trump follows through on similar threats against Italy and Spain, it could accelerate Europe’s push for greater military independence—a trend already gaining traction in Brussels.

Rubio’s Mission: Can Damage Control Work?

Rubio’s agenda in Rome reflects a carefully calibrated effort at diplomatic repair. His meetings with Vatican Secretary of State Cardinal Pietro Parolin, Italy’s Foreign Minister Antonio Tajani, and Defense Minister Guido Crosetto are planned, though a direct meeting with Meloni has not been confirmed. The absence of a confirmed sit-down with the Italian prime minister underscores the depth of the current rift, even within the State Department.

Rubio’s background—both as a Catholic and a trusted Trump ally—could either facilitate or complicate his mission. While Trump has praised Rubio as an effective secretary of state, the president’s own rhetoric has made it difficult for Rubio to present a unified U.S. position. The secretary’s challenge will be to reassure both the Vatican and Italy of America’s commitment to dialogue while maintaining firmness on Iran policy.

However, the timing and nature of Trump’s comments have already created significant obstacles. His public criticism of Meloni and subsequent remarks—Probably should weigh a troop drawdown—only reinforced perceptions that the administration views European contributions as optional. Trump’s additional comment that Italy uses the Strait of Hormuz while the U.S. doesn’t need it further diminished the sense that Washington sees Europe as a true partner. Rubio’s visit will now test whether the State Department can still function as a stabilizing force—or if Trump’s transactional foreign policy has irreparably damaged U.S. credibility in Europe.

The Vatican’s Leverage: Why the Pope Won’t Back Down

Pope Leo’s unwavering stance on Iran represents the most unpredictable factor in this crisis. Unlike previous popes, Leo—a former U.S. citizen—has made it clear the Vatican will not remain neutral in global conflicts. His repeated calls for diplomatic solutions and opposition to regime-change strategies have placed him in direct opposition to both U.S. and Israeli positions. Trump’s personal attack—hurting the Catholic Church!—was seen not just as political rhetoric but as an attempt to undermine the Vatican’s moral standing on the world stage.

The pope’s influence extends beyond traditional diplomatic channels. The Vatican’s ability to mobilize Catholic communities—particularly in Europe, where the Church retains significant political sway—cannot be underestimated. While the Vatican lacks military or economic power, its capacity to shape public opinion and domestic politics in countries like Italy, Poland, and France remains substantial. If Leo continues to oppose U.S. policy, he risks further isolation, but any concession would undermine his credibility as a global moral leader.

Rubio’s meeting with Parolin on May 7 will be decisive. While Parolin is known for his diplomatic approach, his response will determine whether the crisis can be contained. If he signals a willingness to explore renewed dialogue, it could encourage Meloni to engage more directly. However, if the Vatican maintains its opposition to the Iran policy, the U.S. may face a united European front—one that includes both Rome and the Holy See.

What’s Next: The Limits of Damage Control

The immediate outcome of Rubio’s visit is secondary to the broader question of whether the Trump administration can reverse the trend of declining transatlantic cohesion. The troop reductions from Germany, the public disputes with Meloni, and the Vatican’s defiance collectively reflect a fundamental shift: Europe is no longer accepting U.S. leadership on foreign policy without significant pushback.

For Meloni, the decision is stark—either she risks further alienating Washington by maintaining her Iran stance or she risks domestic backlash by appearing to concede to Trump’s demands. The Vatican, meanwhile, has already made clear it will not compromise on its peace advocacy. Rubio, despite his diplomatic experience, is constrained by the fact that his own administration has already strained these relationships through its rhetoric and actions.

This crisis exposes the fragility of the post-Cold War alliance system. When a U.S. president treats NATO partners as expendable and moral authorities like the pope as political adversaries, the consequences extend beyond diplomacy—they threaten strategic stability. The troop withdrawals, public feuds, and Vatican’s defiance are all symptoms of a deeper erosion of trust between Washington and its European allies.

Rubio’s efforts may provide temporary relief, but unless the White House alters its approach, the long-term damage will be irreversible.