Former National Security Adviser Mike Waltz is possibly undergoing a massive career switch-up after resigning (or being ousted) from his position after the now-infamous Signal chat leak with Defense Sec. Pete Hegseth and others.

Shortly after he took responsibility for the Signal chat debacle, Waltz was tapped by President Donald Trump to serve as the U.S. Ambassador to the United Nations -- a top tier gig that was described as an "upgrade" by the president. 

However, he'll need Senate confirmation for the job, and according to Fox News, some top senators are already predicting that his confirmation process will be "brutal."

Democratic senators are already lining up to shoot Waltz's confirmation down and presumably hoping to convince some Republican senators to join them.

What's going on?

Sen. Tammy Duckworth, a Democrat from Illinois, recently revealed on CBS News' "Face the Nation" that she believes Waltz is in for a tough time in his Senate confirmation process.

"It will be a brutal, brutal hearing. He's not qualified for the job, just by nature of the fact that he participated in this Signal chain," Duckworth said, referring to the Signal chat that led to his ouster at the National Security Adviser level.

"Mike Waltz is doing what we call – he is failing up," Duckworth added. "He is failing in his job and getting promoted to be ambassador. That's not what our nation needs at the United Nations."

Sen. Mark Warner of Virginia, a Democrsat, echoed Duckworth's thoughts on the matter.

"I think it will be a brutal confirmation hearing," Sen. Warner said to CNN’s "State of the Union." "I think he's going to have tough questions, not only from Democrats but from Republicans."

Undoubtedly, those questions will likely be solely focused on the Signal chat controversy. Waltz admitted he was the person who incidentally added an editor of The Atlantic to the chat -- a chat that dealt with plans to strike Houthi military targets in Yemen.

When is it happening?

As it stands, it remains unclear when the Senate Foreign Relations Committee will convene to begin the process of Waltz's confirmation process.

He'll first need a "yes" vote out of that committee to get to the full Senate confirmation hearing.

The committee recently indicated that his confirmation process is a "priority."

The only thing that could help make it less painful and a lot quicker than normal is that he still has President Trump's full support.