At the direction of President Donald Trump, Vance privately conveyed that Trump is prepared for a ceasefire, provided certain U.S. demands are met, a source told Reuters. Vance also relayed what the source described as a "sharp message" that Trump is growing impatient, warning that pressure on Iranian infrastructure will increase if Tehran does not agree to a deal. Pakistan, according to the source, is acting as a mediator between the United States and Iran. Vance has taken on a larger role in efforts to negotiate an end to the war, now in its fifth week. He is considered a potential successor to Trump in the 2028 presidential election and has adopted a cautious approach in this conflict, reflecting his long-standing skepticism of prolonged U.S. military engagement abroad. The source noted that the team Trump said is involved in the negotiations remains engaged. Besides Vance, the negotiations include Secretary of State Marco Rubio and U.S. envoys Steve Witkoff and Jared Kushner. Trump has warned that the United States could attack Iranian infrastructure but has delayed such strikes on the power grid until April 6, hoping to reach an agreement with Tehran.