The media giant is dropping its right-wing "must-run" segments by Boris Epshteyn, its chief political analyst and former aide to President Donald Trump.
The congresswoman used the foot-in-mouth moment to show how misinformation spreads.
Loomer was recently banned from Twitter for promoting hateful anti-Muslim views.
The segment is reportedly a "must run" for Sinclair, the largest U.S. owner of local TV stations by number of outlets.
"If you want to make a difference, lobby your lawmakers to have them stop the Tribune deal," the anchor says.
The mean and increasingly incoherent presidential campaign of Donald Trump is oddly enhanced (in entertainment) by the spectacle of his surrogates on cable news shows.
And he seems to be taking their advice.