Burr, who is leading the Senate investigation, said Tuesday night that he was "troubled" by the timing and reasoning of Comey's firing and that the dismissal "further confuses an already hard investigation by our committee".
"I don't think that's a good idea", he told Fox News Channel host Bret Baier.
"There has been no evidence.that suggests that this collusion occurred, and I really think it's important that people know that", Ryan said.
- About what some consider a threat by President Donald Trump, directed at former FBI Director James Comey in a tweet Friday, among several Comey questions.
"I would like to say yes but I'm not going to put an artificial deadline on it", Ryan said when asked if he could get it done by the summer. If the House version passes the Senate as is, which many lawmakers say is unlikely in the next few months, it is not likely to give insurance companies enough time to come up with new plans that could lower premiums until 2020.
And so, I think the president looked at the situation and made a decision that a president can make, which is to remove the Federal Bureau of Investigation director, " Ryan said.
The Wisconsin Republican was once one of Trump's biggest congressional critics.More news: Kohl's buys turnaround time with profit boost
About 50 protesters gathered outside during Ryan's visit to the high school.
Ryan has defended the firing and rejected calls for the appointment of a special prosecutor to investigate Russia's involvement in the election.
But health care was on the mind of demonstrators who held signs and chanted in front of Badger High school in Lake Geneva and Prestige Paints in Delavan, Ryan's two stops Friday afternoon. The students didn't ask about President Trump or current events during the 20-minute Q&A, and the speaker never said the president's name. "I'm doing it in a way so constituents don't go into a harassing environment".
"I'm going to leave the president to talk about and defend his tweets".
When speaking of the investigation into collusion between Russian Federation and the 2016 Trump campaign, Ryan said there are "no allegations there has been collusion".
Ryan also responded to criticism from Democrats and some constituents that he hasn't held recent town halls in the southern Wisconsin district he represents.
"I'm doing it in different ways", Ryan said.