Trump is ramping up his attacks on President Volodymyr Zelenskyy and U.S. financial support for Ukraine's war against Russia.

The directive, which takes effect immediately, affects more than $1 billion in arms and ammunition in the pipelines and on order.

President Donald Trump is ordering a pause on shipments of US military aid to Ukraine after his heated Oval Office argument with Ukrainian President Volodymyr Zelensky last week, a White House official told CNN Monday.