Donald Trump has been interrupted by protesters just minutes into a major economic policy speech in Detroit.
Security removed two women who stood up and began shouting as Mr Trump spoke. One woman stood on a chair and was quickly pulled down and escorted. Another stood up several minutes later and was also removed.
It was unclear what the women were shouting.
Audience members are largely showing support for the women's removal, applauding as security guards lead them out. One person in the crowd shouted: "We love you, Trump."
After the third protester, Mr Trump said: This is what happens when you go from 35 people to 2,000."
Mr Trump used the speech to go after Democratic rival Hillary Clinton.
He said she supports policies that have shipped jobs overseas.
He added: "She is the candidate of the past. Ours is the campaign of the future."
Mr Trump is overhauling the income tax proposal he unveiled during the Republican primary and increasing the amount that would be paid by the highest-income earners.
He said that he wants to simplify the tax code to three brackets: 12%, 25% and 33% of income.
That is a change from September, 2015, when he proposed four brackets that would pay zero, 10%, 20% and 25%.
Mr Trump says the "tax simplification will be a major feature" of his plan and calls it "the biggest tax revolution since the Reagan tax reform".