Why was the military not called in when the rioters attacked in Washington?

They were -- and this wasn't just a "riot" .This was an attack on the very foundations of the American Constitution . 

This was an attack  on the legislature ,in an attempt to force it to overturn a democratic election result in favour of a dictatorship ,under Donald Trump .

There are no more serious crimes than that ,in a democracy 

National Guard arrived, you idiot.

Mike Pence activated the National Guard

Wait so now you want the military involved with protests? 

Because they were normal peaceful protesters not rioters, also, why weren’t the military called in for the BLM rioters?

Who has the authority to call the military in? And Pence did eventually call in the National Guard to enforce the 6pm curfew set by the mayor of D.C.. The Department of Defense denied requests for additional Guardsmen. The FBI was called in to help the local police as well.

Military can't be employed domestically except for a full out insurrection or invasion. Only the National Guard can. Took a while for the National Guard to arrive because all the members had to be notified to muster.

........

Davie Bwoi, the National Guard was employed eight times last Summer, you ignorant twit.

They're self-isolating.

It was the Presidents call or whomever under him that want's to be fired.

Are the National Guard not considered military?

White privilege.