President Trump targeted some unnamed members of his party in a tweet on Sunday, saying that "sad" Republicans who benefited from his electoral coattails in the 2016 election now won't "protect" him.

"It's very sad that Republicans, even some that were carried over the line on my back, do very little to protect their President," Trump tweeted.

It's very sad that Republicans, even some that were carried over the line on my back, do very little to protect their President. — Donald J. Trump (@realDonaldTrump) July 23, 2017

It's not clear what issue Trump wants to be protected on, although his presidency has been challenged both by a failure to pass a promised ObamaCare repeal and the continuing investigations into potential ties between his campaign and the Russian government.