President Donald Trump ordered a halt on all U.S. military aid to Ukraine after a contentious meeting on Friday with Ukrainian President Volodymyr Zelensky at the White House.

Senior U.S. officials speaking with outlets including the Associated Press and Bloomberg confirmed that the halt in aid would begin immediately. The official speaking with the former said that the U.S. was “pausing and reviewing” its aid to “ensure that it is contributing to a solution.”

A senior Defense Department official speaking with the latter said the halt in aid includes a freezing of equipment currently in transit on aircraft and ships or waiting in transit areas in Poland. Defense Secretary Pete Hegseth was ordered to carry out the pause.

The official said the pause would remain in place until Trump determines that Zelensky and the country’s leaders have demonstrated a good-faith commitment to peace.

Denouncements from Trump’s critics came quickly.

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Rep. Brendan Boyle (D-PA), co-chairman of the congressional EU Caucus, denounced the pause as “reckless, indefensible, and a direct threat to our national security.”

“This aid was approved by Congress on a bipartisan basis—Republicans and Democrats alike recognized that standing with Ukraine is standing for democracy and against Putin’s aggression,” he said in a statement. “Yet, Trump, who has repeatedly praised Putin and undermined our allies, is now playing political games with critical military assistance.”