Some Republican senators who voted Thursday against terminating the President Donald Trump’s national emergency declaration may face backlash for risking military projects in their home states.

Twelve GOP senators joined all Democrats in voting for the joint resolution to block the president’s bid to redirect up to $6.7 billion from other Cabinet departments for his southern border wall. But 41 Republicans, some facing competitive re-elections in 2020, voted against the measure.

In the weeks since Trump announced his national emergency decision, concerns among Republicans have chiefly centered on constitutional questions about skewing the balance of powers toward the executive branch and away from Congress.

But there is another more tangible concern for the senators to grapple with: To unilaterally finance the wall, Trump must divert funds away from military construction projects. Some Republicans in the House broke ranks over the contentious maneuver last month.

Trump has stated he intends to veto the resolution, and neither chamber appears to have the necessary supermajority to override him. That tees up the reallocation of more than a third of the $10 billion Congress earmarked for fiscal 2019 for military construction funds, or MILCON, toward the wall.