In a media stand up in Wellington today, Bridges said he had complied with electoral laws and done nothing wrong.
Bridges said Ross was "lying, leaking" and "lashing out" and has welcomed police investigating the rogue MP's claims about donations to National.
He rejected Ross calling him a "corrupt" politician who was not fit to be prime minister.
Todd McClay said he stood beside Bridges.
"These claims are baseless. I agree with Simon Bridges, Mr Ross should take this to the police and they should investigate them fully."
McClay said that he backed Bridges "100 per cent".
"This is not a matter of leadership, it's about one individual who has shown significant disloyalty to every caucus member."
McClay said the entire caucus was disappointed. "We've been working very hard over the past year. Again, this is about one person who has shown great disloyalty to caucus."
But he didn't believe Ross' actions had caused any damage to National.
Bay of Plenty MP Todd Muller said he was "extremely disappointed" in Ross' actions.
"We get elected to work for the interests of our community, their interests must guide our actions, not ego-driven ambition and subsequent anger if you don't get the job you want from the leader.
"I was pleased the caucus support the expulsion motion. I think Simon has handled a very complex and sensitive issue very well and he has the complete support from me and the National caucus."
Tauranga-based Labour list MP Jan Tinetti said she didn't want to comment on the National Party issues.