Donald Trump had two reactions to the first Democratic debate: the Democrats' 2016 field is quite boring, and Bernie Sanders has no business being president.

In one of his patented Instagram posts Wednesday, Trump took aim at the Vermont socialist, ripping him for not being a "tough, strong leader" and unfit to "defend" the U.S.

In the spot, it shows video of Sanders giving up the microphone to Black Lives Matter protesters during an August event in Seattle , for which Trump had previously blasted Sanders.

"The world is a dangerous place. We need a tough, strong leader," the ad's voiceover says before declaring, "and it's not this guy."

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