The Republican National Committee chair turned NBC politics analyst Ronna McDaniel “tried to disassemble our democracy” by supporting Donald Trump’s electoral fraud lies and should not be given such a media role, a leading historian said amid uproar over the appointment.

“What NBC has done is they’ve invited into what should be a normal framework someone who doesn’t believe that framework should exist at all,” Timothy Snyder, a Yale professor and author of On Tyranny, told MSNBC, part of the network now employing McDaniel.