Trump, who told advisers he was spurned in a large spending bill last week when lawmakers only appropriated $1.6 billion for the border wall, has begun suggesting the Pentagon could fund the sprawling construction, citing a “national security” risk.

After floating the notion to several advisers last week, he told Speaker Paul D. Ryan (R-Wis.) that the military should pay for the wall in a meeting last Wednesday in the White House residence, according to three people familiar with the meeting. Ryan offered little reaction to the notion, these people said, but senior Capitol Hill officials later said it was an unlikely prospect.