Make a blatantly false statement, then backfill to cover the lie. That whole thing about millions of non citizens voting? It just something he made up. It's a colossal waste of time and money.
Trump claimed, and continues to claim, 3 to 5 million illegal votes:
Following the 2016 election, Trump claimed that 3 million to 5 million illegal votes caused him to lose the popular vote. That's clearly a fabrication, and efforts to prove his assertion have come up empty.
What's going on here?
Making a statement and then hunting for facts to support it is known in psychology as confirmation bias, and when done deliberately to defend a false claim, it is a form of rationalization or backward reasoning. The administration and the Justice Department are accused of by a judge doing the same thing after banning three news outlets from the White House.
State election officials in Texas investigated registered voters who were flagged as noncitizens on their voter rolls by Trump's federal voter database before a judge blocked its use. Of the 2,724 registered voters, it referred 117 cases to the Texas attorney general's office for investigation. In mid-September, seven people in the state were charged with illegally voting in federal elections or falsely claiming citizenship. Texas has about 18 million registered voters. (PBS News Hour)
Overall 1,600 voter fraud cases that have led to 160 arrests out of 211 million active registered voters. Charged and arrested is not the same as being convicted.
BTW, offering to pay people to vote is illegal.
Whoever makes or offers to make an expenditure to any person, either to vote or withhold his vote, or to vote for or against any candidate; and Whoever solicits, accepts, or receives any such expenditure in consideration of his vote or the withholding of his vote—
Shall be fined under this title or imprisoned not more than one year, or both; and if the violation was willful, shall be fined under this title or imprisoned not more than two years, or both.
18 U.S. Code § 597 - Expenditures to influence voting




