One of Donald Trump's top advisers repeated the president's new claim that 'thousands' of voters from Massachusetts were 'brought in on buses' to vote 'illegally' next door in New Hampshire during the 2016 election.

Making his Sunday shows debut, White House Senior Policy Adviser Stephen Miller didn't back down when ABC's George Stephanopoulos confronted him and asked him to provide evidence that there was widespread voter fraud in New Hampshire, a state that Trump lost to Democrat Hillary Clinton.

'I've actually, having worked before on a campaign in New Hampshire, I can tell you that this issue of busing voters in to New Hampshire is widely known by anyone who's worked in New Hampshire,' Miller replied. 'It's very real, it's very serious.'

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White House Senior Policy Adviser Stephen Miller said President Donald Trump's claims that Massachusetts voters were brought into New Hampshire on Election Day were 'very real'

ABC's This Week host George Stephanopoulos asked Stephen Miller for concrete evidence of voter fraud in New Hampshire on several occasions throughout the interview

Since losing the popular vote to Clinton – but winning the Electoral College and thus the White House – Trump has made a number of claims about widespread voter fraud, suggesting it numbered in the millions.

The White House has provided no evidence to the Federal Election Commission to back this up, though Trump has promised to sign an executive order on the topic and told Bill O'Reilly last week that he was going to task Vice President Mike Pence with chairing a commission on the matter as well.

This week, in a closed-door meeting at the White House with both Republican and Democratic senators, Trump made the claims about New Hampshire, Politico reported, suggesting that's why he lost the state – and that's why former Sen. Kelly Ayotte, a New Hampshire Republican, lost her election as well.

Miller didn't doubt it.

'This morning on this show is not the venue for me to lay out all the evidence, but I can tell you this, voter fraud is a serious problem in this country,' Miller told the This Week host today. 'You have millions of people who are registered in two states, who are dead who are registered to vote, and you have 14 percent of non-citizens, according to academic research, at a minimum, are registered to vote.'

'Which is an astonishing statistic,' Miller added.

The study that Miller was referring to has been widely discredited and the White House has been citing the 14 percent statistic incorrectly, Polifact previously reported.

As for his other two statements, it is true that people are often registered in two places and the deceased are not taken off the rolls, but neither of those things are illegal, nor do they represent voter fraud.

They also don't substantiate Trump's claims of individuals being bused into the state from the more liberal Massachusetts.

Stephen Miller (pictured) got into a back-and-forth with ABC's George Stephanopoulos over new voter fraud claims President Donald Trump made to senators this week

Stephanopoulos paused the White House official to clarify what he had just said.

'You just claimed again that there was illegal voting in New Hampshire, people bused in from the state of Massachusetts. Do you have evidence of that?' the newsman asked.

Miller told Stephanopoulos that he should talk to 'anybody who's worked in politics there for a long time.'

Stephanopoulos called for evidence again.

'If this is an issue that interests you, then we can talk about it more in the future,' Miller answered, pointing to how the Trump administration is just now gearing up and again making the claim that non-citizens are registered to vote.

Stephanopoulos stopped the 31-year-old staffer and pointed out that he had 'provided absolutely no evidence.'

'The White House has provided enormous evidence with respect to voter fraud,' Miller answered.

He repeated that some people were registered to vote in two states, that dead people were left on the rolls and that non-citizens were being registered to vote.

'That is a scandal!' Miller said.

'We should stop the presses and as a country we should be aghast about the fact that you have people who have no right to vote in this country registered to vote, canceling out the franchise of lawful citizens of this country,' Miller continued. 'That’s the story we should be talking about!'

'And I’m prepared to go on any show, anywhere, any time, and repeat it and say the President of the United States is correct, 100 percent,' he said.

Stephanopoulos pointed out that the staffer had merely repeated 'declarations,' but not actually provided evidence.

'Thanks a lot for joining us in the morning,' Stephanopoulos said, trying to cut the aide off.

Miller continued, however, again pointing to the 'non-citizen voting issue.'

'The non-citizen voting issue is pervasive and widespread and we are going to protect our country from voter fraud,' Trump's adviser declared.

'We’re going to protect our borders from terrorism. And we’re going to protect innocent men, women, and children from violent criminal illegal immigrants that need to be removed from this country,' Miller said. 'And our country will create jobs, safety, prosperity, and security – particularly for disenfranchised working people of every background, faith, and ethnicity in this country.'

Stephanopoulos gave himself the last word.

'You can start by providing evidence to back up your claims,' he said, before thanking the aide and ushering Miller off his program.

'Thank you,' Miller said.