In a meeting last Wednesday in the White House residence, President Trump told Speaker Ryan that the U.S. military should pay for his border wall, the WashPost's Josh Dawsey and Mike DeBonis report and a source familiar confirms to Axios.

Why it's happening: "Trump has told advisers that he was spurned in a large spending bill last week when lawmakers appropriated only $1.6 billion for the border wall."

• "Ryan offered little ­reaction to the idea ... [S]enior Capitol Hill officials later said it was an unlikely prospect."
• "He has suggested to Defense Secretary Jim Mattis ... that the Pentagon could fund the sprawling project, citing a 'national security' risk."

Be smart: Trump has to think of something. Some top alumni of his campaign think that the wall was such a centerpiece promise, it's the one issue the base might desert over. So Trump has to come up with some plausible "wall" by 2020.