Secretary of State Marco Rubio stood silent and stone-faced behind Donald Trump on Wednesday as the president joked of passing the buck if his deal with Iran, under increasingly withering criticism and scrutiny, ultimately falls apart. The blame, Trump said, would likely fall on his vice president, JD Vance, who led the negotiations toward a memorandum of understanding with Iran and will sign the agreement this week in Switzerland — a ceremony that will generate indelible images for a politician openly considering a run for the White House. The controversial diplomatic breakthrough poses a quandary for Vance, whose aides see Rubio as his most viable challenger for the Republican presidential nomination should the secretary choose to run. “If it works out, I’m going to take the credit,” Trump said of the Iran deal, with Rubio by his side.

"This way, if it works out, I'm going to take the credit," Trump said. "If it doesn't work out, I'm blaming JD."

Secretary of State Marco Rubio stood silent and stone-faced behind Donald Trump on Wednesday as the president joked of passing the buck if his deal with Iran, under increasingly…