Donald Trump may have issued the first veto of his presidency, to put the breaks on the congressional resolution of disapproval which would have terminated his declared “state of emergency” at the southern border but House Speaker Nancy Pelosi is not leaving it there.

Trump declared the emergency in order to bypass Congress and essentially raid military funding to build the wall he wants along the southern border.

Congress responded by passing a resolution of disapproval to put an end to Trump’s “emergency” move. Democrats, and some Republicans, object to Trump’s emergency declaration as a violation of the Constitution’s separation of powers, as well as Congress holding the power of the purse.

After Trump issued his veto, Pelosi immediately set March 26 as the day that the House will attempt to override the veto.

To do so will require a supermajority of two-thirds in both the House and Senate to successfully override the veto.

“The House and Senate resoundingly rejected the president’s lawless power grab, yet the president has chosen to continue to defy the Constitution, the Congress and the will of the American people,” Pelosi said.

When originally passed, the resolution of disapproval did so in neither the House nor Senate to guarantee overcoming the veto.

That means the resolution would have to draw additional support from among House Republicans to override the veto.

And that’s squarely where Pelosi is putting her pressure.

“House Republicans will have to choose between their partisan hypocrisy and their sacred oath to support and defend the Constitution,” she said.

Pelosi knows that she has majority public opinion on her side. Some 65 percent of Americans oppose Trump’s emergency declaration, while just 33 percent approve. That’s according to a Monmouth poll released this month.