Trump will almost certainly win all 28 of the state's delegates, which means he'll need just 66 more delegates to reach the threshold of 1,237.

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The businessman entered the Oregon primary with 1,143 delegates after picking up nine in Guam earlier Tuesday, according to The Associated Press.

Cruz last month had agreed to cede the state to Kasich, in the hopes that the more moderate Ohio governor could win and block Trump's path. But the two dropped out weeks before the plan could come to fruition.

Washington state’s GOP primary is next Tuesday. All that remains in the race after that are the June 7 primaries, when California, Montana, New Jersey, New Mexico and South Dakota will vote.