US President Joe Biden asserted his will to be in the White House race and said he was feeling sick due to a cold during the presidential debate on June 28. The rebellion is currently brewing among the core Democrat voters in and beyond the blue states after Biden's terrible debate performance against Donald Trump. .

"I was sick, I was feeling terrible... We were trying to figure out what's wrong," the president said in an excerpt of his first TV interview since the debate.

"They did a test to see whether or not I had some infection, you know, a virus. I didn't. I just had a really bad cold."

Biden also responded to the calls for a cognitive test during the ABC interview. "I have a cognitive test every single day. Every day I have that test, everything I do," Biden, 81, said.

The Biden campaign continues to push back hard on any suggestion he may withdraw. Hours before the ABC interview, they released an aggressive campaign travel schedule for the rest of July.

Appearing at a campaign rally in Madison, Wisconsin, Biden tried to put an energetic face to declare, "I'm staying in the race. I'll beat Donald Trump."

"Let's focus on what really matters," Biden said, reading from teleprompters. "We're running against the biggest liar and the biggest threat... to our democracy in American history -- that's not hyperbole."

The president will "engage in frequent off-the-cuff moments over the course of the month, as he has consistently throughout this campaign," his team said.

With speculation swirling over a potential switch in the Democratic ticket, Kamala Harris, the nation's first female vice president, has suddenly been in the spotlight.