I believe Conway because she spoke about this before, in October 2016, in an interview with Chris Matthews, right after the Access Hollywood tape of Donald Trump's "locker room talk" came out.
KELLYANNE CONWAY: I would talk to some of the members of Congress out there when I was younger and prettier, them rubbing up against girls, sticking their tongues down women's throats who - uninvited, who didn't like it.
CHRIS MATTHEWS: Yes.
CONWAY: Yes, you're saying yes because you know it's true. They used to -
MATTHEWS: No, I'm hearing it - I've heard the accounts, of course, but I want to ask you –
CONWAY: They did - no, absolutely. And some of them, by the way, on the list of people who won't support Donald Trump because they all ride around on their high horse.
Conor Friedersdorf summed up that exchange at the time: "the GOP nominee’s campaign manager declared on national television that multiple prominent Republicans –– some who oppose Trump, and others, apparently, who support him –– perpetrated sexual assaults, and she knows their names."
The headline on that story was, "Trump Tries to Intimidate Republicans Into Sticking With Him" and the subhead was, "His campaign manager, Kellyanne Conway, warned that she knows of GOP congressmen who perpetrated sexual assaults."