Rep. James Clyburn and a group of House Democrats are urging President Barack Obama to invoke the 14th Amendment to raise the debt ceiling if Congress can’t come up with a satisfactory plan before the Tuesday deadline.

Clyburn, the third-ranking House Democrat, said Wednesday that if the president is delivered a bill to raise the debt ceiling for only a short period of time, he should instead veto it and turn to the phrase in the Constitution that says the validity of the U.S. government’s debt “shall not be questioned.”