Many of National's Auckland-based MPs flew back to Wellington on Tuesday morning, taking advantage of new Parliament rules that made it far easier for Auckland MPs to commute to Wellington.
One of Collins' close allies, Simeon Brown, would not deny that he had been approached by other MPs to roll her.
Asked whether he had been approached by other MPs to swing his support behind another leader, Brown said, "look, what we're focused on is holding the Government to account for the decisions they've made in Auckland in the last 12 weeks".
Fellow MP, Chris Penk, however, said he had not been approached by other MPs sounding out a coup.
The pair arrived with fellow MP, Mark Mitchell. All three said they still had confidence in Collins as leader and they believed she had done a good job.
"100 per cent - absolutely," Mitchell said, when asked whether he had confidence in Collins.
When asked whether there would be a coup this week, Mitchell laughed and said "there's going to be a focus on holding the Government to account".
Bridges said that he had not been the person who had approached Brown.
"Certainly, I haven't approached anyone," Bridges said.
He said he was not aware that any of his supporters had approached Brown about a potential challenge.
"No - not to my knowledge, I mean it's not my intention to seek the leadership of the National Party," Bridges said.