Domenico Montanaro

Trump is on something of a revenge tour.

The latest casualty, Congressman Thomas Massey of Kentucky.

He lost to a Trump-backed challenger by about 10 points Tuesday night, and he saw tens of millions of dollars spent against him.

In fact, it was the most expensive House primary in history with $33 million spent on TV ads.

Massey was a thorn in Trump's side

helping force the release of millions of pages of the Epstein files, for example.

Now he joins a list of perceived political enemies that Trump has gone after, often successfully, in GOP primaries.

But while Trump has proven his strength with the Republican base, general elections are a different story, and that'll likely put Republican candidates in swing districts in tough positions this fall.

Domenico Montanaro, NPR News, Washington.

Trump is on something of a revenge tour.

The latest casualty, Congressman Thomas Massey of Kentucky.

He lost to a Trump-backed challenger by about 10 points Tuesday night.

and he saw tens of millions of dollars spent against him.

In fact, it was the most expensive House primary in history, with $33 million spent on TV ads.

Massey was a thorn in Trump's side, helping force the release of millions of pages of the Epstein files, for example.

Now he joins a list of perceived political enemies that Trump has gone after, often successfully, in GOP primaries.

But while Trump has proven his strength with the Republican base, general elections are a different story, and that'll likely put Republican candidates in swing districts

in tough positions this fall.

Domenico Montanaro, NPR News, Washington.

Trump is on something of a revenge tour.