Rep. Charles Boustany, R-La., told CNBC on Thursday he's confident congressional investigators will follow the "paper trail" to hold to account those responsible for the Internal Revenue Service's targeting of conservative nonprofit groups.
Boustany, head of the House Ways and Means Subcommittee on Oversight, said in a "Squawk Box" interview that he's been looking into allegations of IRS abuses for two years and he been faced with "stonewalling."
"We're going to reign in this culture of rot and abuse," he said. "The [Obama] administration should have known … what's going on. It's a very serious."
The House Ways and Means Committee—which has jurisdiction over all U.S. tax policy—is scheduled to hold a hearing into the matter on Friday. Outgoing IRS Acting Commissioner Steven Miller is expected to testify, as is the Treasury inspector general investigating the complaints, J. Russell George.