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(CNN) —  

President Donald Trump said in an interview aired Sunday that he’s not prepared to lose the 2020 presidential election.

“It would be much better if I said, ‘Yeah.’ It would be much easier for me to say, ‘Oh, yes.’ No, I’m probably not too prepared to lose. I don’t like losing. I haven’t lost very much in my life,” Trump told NBC’s “Meet the Press.”

Trump also subsequently reasserted that he doesn’t “believe” in the validity of “a lot” of votes cast which show he lost the popular vote in 2016 to Hillary Clinton.

“I’ll say something that, again, is controversial. There were a lot of votes cast that I don’t believe,” Trump said.

Outwardly, the President seems to be trudging forward with the idea that he’s an unstoppable candidate – tweeting out a video on Friday showing fictitious Trump campaign signs (e.g. “Trump 2040”) for every election until just about the end of time.

But within the Trump campaign, polling numbers suggest some concern over his viability in some key states.

The Trump campaign fired several pollsters after internal polling numbers showed the President lagging behind Democratic presidential candidates in key states were made public, multiple sources told CNN last week.

CNN and other outlets first reported the numbers – which showed Trump trailing former Vice President Joe Biden in states like Michigan and Wisconsin – weeks earlier, but a purge of the polling team was proposed after Trump grew angry about coverage of them.

On “Meet the Press,” the President also spoke about the upcoming election, confirming that Vice President Mike Pence would be his running mate for his 2020 run.

But Trump stopped short of offering Pence an endorsement for a hypothetical 2024 presidential run because the prospect is “so far out.” Trump was asked the same hypothetical earlier this month on “Fox and Friends.”

“I’m not even thinking of it. It’s so far out. I mean, It’s so far out. That would be the only reason,” Trump told “Meet the Press,” Sunday adding, “Now what happens in 2024? I don’t know that Mike is going to run. I don’t know who’s running or anything else.”

Trump also said it was a “tremendous embarrassment” to Biden that former President Barack Obama’s hadn’t endorsed the former vice president yet.

He also said he “may” address election interference with Russian President Vladimir Putin at the upcoming G20 summit.

“Are you going to tell him not to do it?” “Meet the Press” host Chuck Todd asked.

Trump responded, “I may if you’d like me to do it, I’ll do that.”

The President said he believes House Speaker Nancy Pelosi is not giving in to pressure from within her caucus to initiate impeachment proceedings because she fears doing so would benefit him politically.

“I think she feels that I will win much easier,” Trump said. “I mean, I’ve been told that by many people.”

Despite arguing impeachment would boost his reelection prospects, the President said he does not like the specter of impeachment hanging over him.

“I’m not sure that I like having it. Look, I did nothing wrong,” Trump said before calling impeachment “a very unfair thing.”

CNN’s Sarah Westwood, Kaitlan Collins, Jeremy Diamond and Jeff Zeleny contributed to this report.