Amash, who has already survived several primary challenges from establishment Republicans in the past, has also been singled out by Trump himself, who recently vowed to "fight" both the Freedom Caucus and Democrats in future elections. Trump said in Thursday tweet after the House Freedom Caucus members effectively derailed the Republican-led health care bill last month.
A White House aide made an unusual move Saturday by publicly urging voters to oppose a congressman from President Donald Trump's own party. @justinamash is a big liability.#TrumpTrain, defeat him in primary. Rand Paul has a competing ObamaCare replacement bill, said White House Budget Director Mick Mulvaney told him: "The president asked me to look you square in the eyes and to say that he hoped that you voted "no" on this bill so he could run (a primary challenger) against you in 2018", according to the paper.
Previously, Amash had tweeted that instead of draining the swamp, Trump was being sucked into it.
Scavino's criticisms of Amash come from his personal Twitter account, rather than his official White House account.
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Spokesmen for the White House did not immediately reply to requests for comment on Scavino's tweet.
Daniel Jacobson, a White House lawyer under President Barack Obama, tweeted that White House staff "can't use an official or de facto govt Twitter acct (which this is) to call for defeat of a candidate". De facto means that if you tweet only about WH work from your account, it's an official account.
The direct intervention by Scavino, who has worked for Trump since caddying for the then-real estate developer as a teenager, is however a new sign of division between Trump and congressional Republicans.
"The Freedom Caucus will hurt the entire Republican agenda if they don't get on the team, & fast. Bush WH would have fired him", he added.
Many members of the Freedom Caucus thought the bill, which was widely criticised for its likely removal of insurance from millions of Americans, in fact left government with too prominent a role in the provision of healthcare.