Members of the House Ways and Means Committee have more questions on the Internal Revenue Service targeting conservative groups after outgoing acting commissioner Steve Miller testified before the committee on Friday, Rep. Paul RyanPaul Davis RyanHouse Republicans grumble about the 'worst process ever' Winners and losers from the .3T omnibus Collins: McConnell has 'kept his commitment' on ObamaCare fix MORE (R-Wis.) said.

Asked Friday afternoon in an interview with CNN if Miller answered all the questions Ryan had, the congressman from Wisconsin, who is a member of the Ways and Means Committee, said "no."

"We —we have many more questions that resulted from today's hearing.  The one answer we did get, though, is that the IRS withheld information from Congress," Ryan told CNN's Jake Tapper.

Miller's appearance came a week after the IRS publicly apologized for applying a higher level of scrutiny to conservative organizations applying for tax-exempt status. Since the IRS admitted to targeting conservative organizations, a number of congressional committees have planned hearings investigating the service's conduct.

Ryan said Ways and Means had been receiving reports about the IRS focusing on conservative organizations.

"Jake, you had to know that last year, we had these investigations on the Ways and Means Committee," Ryan said. "We were receiving all of these reports of this kind of harassment.  We questioned the IRS in hearings, in letters, and the IRS withheld all of this information that they were in possession of as to whether this targeting was occurring or not.

"We do now know that this targeting did occur, that it was politically biased.  It was only of conservative groups.  Now we're getting lots of questions with respect to religious groups and other kinds of groups."