WASHINGTON — Defense Secretary Mark Esper on Tuesday approved the use of $3.6 billion in funding from military construction projects to build 175 miles of President Donald Trump’s wall along the Mexican border.

Pentagon officials would not say which 127 projects will be affected, but said half the money will come from military projects in the U.S.

Congress approved $1.375 billion for wall construction in this year’s budget, far less than the $5.7 billion that the White House sought. Trump grudgingly accepted the money to end a 35-day government shutdown in February but simultaneously declared a national emergency to take money from other government accounts, identifying up to $8.1 billion for wall construction.