If it was Antifa who was completely behind this- how come Trump didn't stop them?

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https://www.newsweek.com/donald-trump-supporter-jan-6-blaming-anifa-storming-capitol-building-1695882
Trump Supporter Awkwardly Silenced After Blaming Jan 6 on Antifa

A video of a Donald Trump supporter claiming that Antifa was responsible for the January 6 riots on the Capitol has gone viral on social media.

One of the members of comedy duo The Good Liars, Jason Selvig, spoke to the man at a Trump rally in Michigan and posted the video to his personal Twitter as well as The Good Liars, Twitter page. The video so far has over 1.9 million views.

Referring to the riots, Selvig asked the man why Antifa would want to prevent Joe Biden, a candidate they supported, from becoming president.
If it was Antifa who was completely behind this- how come Trump didn't stop them?
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