A Donald Trump supporter was arrested Tuesday after allegedly pulling a knife on a woman with a baby outside the Lower Manhattan courthouse where reporters have been gathered in anticipation of the former president’s possible indictment.

The unnamed blonde — who was waiving a neon-yellow sign that had “I STAND WITH TRUMP DO YOU?” scrawled in blank ink — got into an argument with another woman around 3:30 p.m. outside Manhattan Supreme Court, law enforcement sources said.

Court Officers spotted the escalating fight, pulled their guns and hauled the blade-wielding woman into custody, the sources said. The knife appeared to be a box cutter, according to photos.

A spokesperson for the court did not immediately have any information on the arrest.

The dust-up took place just feet from the press pen set up not far from the building where a grand jury has been hearing evidence tied to Manhattan District Attorney Alvin Bragg’s case against Trump, 76.

Since Trump claimed he would be arrested on March 21, which led to a surge in donations, there have been at least two bomb threats called into the courthouse and a death threat sent to Bragg.

The former president has called on his supporters to protest any arrest and threatened Bragg with “death and destruction” if he is criminally charged.

The grand jury did not meet on Tuesday and is not expected to consider evidence in the Stormy Daniels “hush money” case for the rest of the week, sources have told The Post.

Bragg reportedly wants to charge the ex-president with falsification of business records related to $130,000 in hush money paid by Trump’s former lawyer Michael Cohen to Daniels ahead of the 2016 presidential election.