BREAKING: Senate approves bipartisan measure limiting President Trump's authority to launch military operations against Iran.

The Senate approved a bipartisan measure Thursday aimed at limiting President Donald Trump’s authority to launch military operations against Iran, with eight Republicans joining Democrats in a post-impeachment bid to constrain the White House.

The rebuke was the Senate’s first major vote since acquitting Trump on impeachment charges last week. Trump is expected to veto the war powers resolution if it reaches his desk, warning that if his “hands were tied, Iran would have a field day.’”

The measure, authored by Sen. Tim Kaine, D-Va., says Trump must win approval from Congress before engaging in further military action against Iran. Kaine and other supporters said the resolution, which passed 55-45, was not about Trump or even the presidency, but instead was an important reassertion of congressional power to declare war.

While Trump and other presidents “must always have the ability to defend the United States from imminent attack, the executive power to initiate war stops there,″ Kaine said. “An offensive war requires a congressional debate and vote.″

The Senate vote continues a pattern in which Republican senators have shown a willingness to challenge Trump on foreign policy, a sharp departure from their strong support during impeachment and on domestic matters. Congress moved to impose restrictions on U.S. involvement with the Saudi-led war in Yemen last year after U.S.-based journalist Jamal Khashoggi was killed in a gruesome murder at Saudi Arabia’s consulate in Turkey.

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