"Here we go again, indeed.

Trump has repeatedly made false claims about voter fraud, continuing to say the 2020 election was "rigged," despite the fact that his own aides, including his attorney general, told him his claims were baseless.

We did not get a response from the Trump campaign when we asked for backup, but it appears he was referring to an interview Carlson, a former Fox News host, did in April with Justin Haskins of the conservative Heartland Institute.

Haskins' title there is "director of the Socialism Research Center," and his bio on the Heartland website describes him as a "widely published writer and political commentator."

In other words, not an "election expert," as Trump described him."

"However, the DOS statement said,

"Mail voting in Pennsylvania has multiple layers of security that involve registered voters having to provide appropriate ID before their mail ballot can be counted and that prevent any voter from casting more than one ballot in any given election.

Pennsylvanians have been voting by mail since the Civil War, and the process has a long history of being safe and secure."