US lawmakers will try again next week to pass a resolution to halt the Iran war and force President Donald Trump to obtain ​Congress’ approval for any further attacks, Senate Democratic Leader Chuck Schumer said ‌on Wednesday, hours after Trump announced a two-week ceasefire.

“Congress must reassert its authority, especially at this dangerous moment,” Schumer told a press conference at his office in New York.

Trump agreed to the ceasefire ​on Tuesday, less than two hours before his deadline for Tehran to ​reopen the blockaded Strait of Hormuz or face devastating attacks on its ⁠civilian infrastructure.

Trump’s threat that “a whole civilisation will die tonight” prompted global concern and ​censure from Democrats, dozens of whom called for Trump’s removal from office. The 1949 Geneva ​Conventions on humanitarian conduct in war prohibit attacks on sites considered essential for civilians.

Schumer called Trump’s statements “unhinged” and criticised the war for failing to weaken Iran’s government or rein in its nuclear ​program, while global fuel prices have risen.

Iran says its nuclear program is peaceful. The ​Trump administration has sought to portray the war as a decisive victory, although the top US general ‌said ⁠US troops stood ready to resume fighting.

The White House says Trump’s actions are legal and within his rights as commander-in-chief to protect the US by ordering limited military operations.

Democrats in the Senate and House of Representatives have tried and repeatedly failed in recent months ​to pass war ​powers resolutions to force ⁠Trump to obtain lawmakers’ authorisation before launching military operations.

Trump’s fellow Republicans in Congress - who hold slim majorities in both the Senate ​and House - have almost unanimously backed his policies. Although the ​US Constitution ⁠says that Congress, not the president, can declare war, that restriction does not apply to short-term operations or if the country faces an immediate threat.

Separately, the Democratic leader in the ⁠House, ​New York Representative Hakeem Jeffries, said the House should ​also vote on a resolution to curb the war on Iran. “We need a permanent end to Donald ​Trump’s reckless war of choice,” Jeffries said on CNN.