On Saturday, Trump took revenge on Louisiana Senator Bill Cassidy for Cassidy’s vote five years ago to convict Trump, in his second impeachment, for instigating an attack on the US Capitol.

Cassidy thereby became the first GOP senator defeated by a Trump-endorsed candidate in a Republican primary. (Other Republican senators who have stood up to Trump — such as North Carolina’s Thom Tillis and Utah’s Mitt Romney — saw the writing on the wall and didn’t seek reelection.)

Trump’s purge of Cassidy comes in the wake of Trump’s purges of House Republicans who stood up to him, such as Wyoming’s Liz Cheney.

• READ MORE: Trump says Iran attack held off upon Gulf states’ request
• Other Donald Trump reports

Trump’s next Republican target in the House is Kentucky representative Thomas Massie, who had the guts to oppose US military involvement in Iran, demand release of the Epstein files, and criticise Trump’s spending bills for adding to the national debt. Massie appears likely to be defeated by a Trump-backed opponent in Tuesday’s Kentucky primary.

Trump is marshaling the full force of his MAGA machine — spending more than $30 million on a House Republican primary — to purge another of his political enemies from the Republican House. Even Secretary of “War” Pete Hegseth is flying to Kentucky to campaign for Massie’s challenger.

It’s all seen as an investment in intimidating and disciplining Republican office-holders who might otherwise think of straying.

Trump has also purged state legislators who have refused to do his bidding, such as the seven Indiana Republicans who refused to redistrict the state as Trump demanded they do, and who Trump insured were defeated in their recent primaries.

The message is clear to every current or aspiring Republican politician: Be a toady to Trump, or you’re out.

In his concession speech Friday night, Cassidy stated the obvious reference to Trump:

“Our country is not about one individual. It is about the welfare of all Americans, and it is about our Constitution.

“And if someone doesn’t understand that and attempts to control others through using the levers of power, they’re about serving themselves. They’re not about serving us. And that person is not qualified to be a leader.”

Nicely put but sadly irrelevant because Trump — who’s clearly serving himself rather than the American public — now possesses all levers of power in the official Republican Party.

As Republican Senator Lindsey Graham said yesterday on Meet the Press, “There’s no room in this party to destroy [Trump’s] agenda.”

Former generations of Republican politicians had principles, beliefs, ideals. They thought the federal government too large. Or believed it spent too much money. Or was too lenient on criminals. Or was too eager to support the civil rights of Black people. Or any number of issues with which Democrats disagreed.

Today’s Republican Party no longer has any purpose other than achieving whatever Trump wants, which is mainly to make Trump richer and more powerful. The GOP is now Trump’s; it is no longer America’s.

Today’s Republican voters, by contrast, are showing increasing frustration with Trump. Those who think of themselves as traditional Republicans don’t like Trump’s expansive use of federal power. Those who are fiscally conservative, like Thomas Massie, are upset by Trump’s wanton spending, tax cuts, and soaring debt.

“America-first” Republican voters are concerned about Trump’s intrusions into Iran, Venezuela, Cuba, and elsewhere. And they want the rest of the Epstein files released.

Yet for elected Republicans, survival now depends on personal loyalty to Trump.

All of which raises a fundamental question: Has the official Republican Party — now nearly purged of anyone willing to reflect the concerns of Republican voters rather than Trump’s will — become complicit in Trump’s criminality? Is it aiding and abetting Trump’s lawlessness?

A case can be made that the official Republican Party is indeed complicit.

For Trump, the first and most basic sign of loyalty to him — and therefore survival as a politician in Trump’s Republican Party — is a willingness to publicly proclaim as truth what we know to be two big lies: that Trump won the 2020 election, and that he did not seek to overturn its results by illegal means. As a result, almost all congressional Republicans are now election deniers.

Trump has also made it clear that loyalty to him bars any criticism of his unlawful immigration dragnet, which has so far resulted in the murders of three US citizens by ICE agents and the detention and deportation, without a hearing, of people suspected of being in the US illegally.

To Trump, loyalty requires full support of his foreign policy — including the abduction of a foreign leader, an undeclared war with Iran, and the killing on the high seas of people only suspected of smuggling drugs, in violation of international law.

Loyalty also demands unquestioned support for other of his lawless acts — using the Justice Department to prosecute his political opponents, building a mammoth White House ballroom, issuing no-bid contracts to his friends, promoting his family’s businesses and implementing policies favorable to them, accepting gifts from foreign powers, and defying court orders.

Is it fair to conclude from all of this that today’s official Republican Party — the people who are in office because Trump has put them there, or who maintain their office because they back whatever Trump wants — has in effect become a criminal organisation, analogous to the mafia or a drug cartel, whose members are blindly loyal to their criminal bosses?

Robert Reich is a US professor, former Secretary of Labor, co-founder of Inequality Media and writes at robertreich.substack.com