Cruz took to the Senate floor around 2:40 p.m. Tuesday. He vowed to speak out against ObamaCare funding until he was “no longer able to stand.” But Democrats are saying it technically isn’t a filibuster since Cruz won’t be able to stop a procedural vote to advance a government spending bill tomorrow afternoon.

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Cruz joked back with Paul, who was the last senator to filibuster the Senate, saying he was embarrassed to admit that he was not wearing his “argument boots,” which he has worn everyday on the Senate floor since being sworn in.

“I had a choice which with I was confronted — do I follow through and wear my argument boots or do I wear more comfortable shoes as the senator recommended,” Cruz said. “I am not in my argument boots.”

Cruz said he was instead wearing more comfortable shoes similar to ones worn by Sen. Orrin HatchOrrin HatchA guide to the committees: Senate 7 key players in the GOP's border tax fight Public lands dispute costs Utah a major trade show MORE (R-Utah).

Senate Majority Leader Harry ReidHarry ReidHopes rise for law to expand access to experimental drugs If Gorsuch pick leads to 'crisis,' Dems should look in mirror first Senate confirms Mulvaney to be Trump’s budget chief MORE (D-Nev.) is expected to advance H.J.Res. 59 with an amendment to remove the House language that defunds ObamaCare. Cruz is objecting because he doesn’t want Reid to strip the House bill of its language to defund ObamaCare.

The government will shut down Oct. 1 if Congress doesn't approve some form of government funding measure.

Paul filibustered the Senate earlier this year for nearly 12 hours in order to stop the administration from using military drones in surveillance against U.S. citizens.