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Watch live: Trump holds rally in Montana

President Trump is holding a rally in Billings, Mont., on Thursday night as he seeks to boost Senate GOP candidates ahead of the November elections.

Trump is speaking amid uproar over an op-ed published anonymously in The New York Times in which a senior administration official blasted the president.

The president has slammed the unidentified official, accusing them of "treason," while various Cabinet members have rushed to denounce the op-ed.

The president's rally is scheduled to begin at 9 p.m. EST.

Watch the live video above.