The Pentagon is planning to tap $1 billion in leftover funds from military pay and pension accounts to help President Donald Trump pay for his long-sought border wall, a top Senate Democrat said Thursday.

Sen. Dick Durbin, D-Ill., told The Associated Press, “It’s coming out of military pay and pensions. $1 billion. That’s the plan.”

Durbin said the funds are available because Army recruitment is down and a voluntary early military retirement program is being underutilized.

The development comes as Pentagon officials are seeking to minimize the amount of wall money that would come from military construction projects that are so cherished by lawmakers.