WASHINGTON - The US state of Maine on Thursday blocked former president Donald Trump from its Republican presidential primary after the top election official ruled him ineligible due to involvement in the January 2021 assault on the US Capitol.

Maine Secretary of State Shenna Bellows said in her ruling that the events of January 6, 2021 "occurred at the behest of, and with the knowledge and support of, the outgoing President."

"The US Constitution does not tolerate an assault on the foundations of our government and (Maine law) requires me to act in response," the ruling read.

Maine joins Colorado which earlier this month also disqualified Trump from its Republican primary, moves that will certainly be challenged in the US Supreme Court.

The rulings in both states invoked the US Constitution's 14th Amendment, which bars from office anyone formerly sworn to protect the country who later engages in insurrection.

Trump's campaign quickly slammed Bellows' ruling as "attempted theft of an election and the disenfranchisement of the American voter."

Campaign spokesman Steven Cheung said Trump would appeal the Maine secretary of state's decision.

AFP