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Amid reports that Donald Trump will announce his running mate prior to the start of the Republican National Convention on July 18, speculation about the VP search is hitting a fever pitch.

Karl Rove appeared on "America's Newsroom" today to analyze several candidates who are said to be on Trump's shortlist.

Retired Lt. Gen. Michael Flynn is a registered Democrat, but he's been a harsh critic of President Obama and an ardent opponent of Islamic extremism, Rove said.

Rove acknowledged that Flynn's pro-choice views will surely cause a "kerfuffle" among the pro-life members the GOP.

Rove also noted that the last time a presidential candidate chose a running mate from the opposite party was 1864, when Republican Abraham Lincoln selected Democrat Andrew Johnson.

Rove said that Indiana Gov. Mike Pence is another leading VP candidate, because Trump has said he would like a running mate with experience in Washington.

Pence certainly has that after serving in the House for more than a decade before becoming governor, Rove said.

Despite that experience, Pence is still seen as a "Washington outsider," according to Rove.

Rove said that if extensive experience in Washington is a prerequisite, then Newt Gingrich could be a very likely choice.

"He is obviously an insider who knows how Congress works," Rove explained.

He also pointed out that Gingrich has been behind Trump for quite a while, and the two have had nice things to say about each other.

He added that Gingrich strongly desires the chance to be a player in a Republican administration, particularly in a role like vice president.

Bill Hemmer noted that New Jersey Gov. Chris Christie and Alabama Sen. Jeff Sessions have also recently been mentioned as names on Trump's VP shortlist.

Who do you think Trump should choose?

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