The Trump administration is furiously trying to fend off a bipartisan effort in Congress to halt American military support to the deadly Saudi-led bombing campaign in Yemen as the kingdom’s influential young crown prince, Mohammed bin Salman, arrives in Washington this week for talks with President Trump.

Even as the State Department weighs approval of more than $1 billion in new arms to the Saudis, lawmakers are pushing for a resolution that they say would prevent Washington from giving the Saudis “a blank check” in the conflict.