Story highlights Sanders wasn't Trump's only target on Tuesday, as he also took aim at Hillary Clinton

Trump also hit his rivals for fundraising efforts that he said ensure access for top donors and contribute to a corrupt political system

Washington (CNN) Donald Trump said Tuesday that Bernie Sanders "showed that he's weak" by allowing #BlackLivesMatter protesters to take his microphone during a weekend event in Seattle.

And Trump -- the Republican presidential contender who, he said, is attracting the biggest crowds to campaign events along with the Democrat Sanders -- vowed: "Believe me, that's not going to happen to Trump."

"I would never give up my microphone. I thought that was disgusting. That showed such weakness, the way he was taken away by two young women -- the microphone; they just took the whole place over," Trump told reporters during an evening news conference before speaking to a Republican group in Michigan.

"That will never happen with me," he said. "I don't know if I'll do the fighting myself or if other people will, but that was a disgrace. I felt badly for him. But it showed that he's weak."

Michael Briggs, a Sanders campaign spokesman, declined to comment about Trump's criticism on Tuesday.

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