WASHINGTON — The Justice Department should enter the investigation of whether Veterans Affairs employees have falsified records to cover up long waits at VA medical facilities, Democratic and Republican lawmakers said Sunday.

“Only the Department of Justice and the FBI have the resources, the expertise and the authority to do a prompt and effective criminal investigation of the secret waiting lists, potential destruction of documents, falsification of records, in effect, the cooking of books and covering up that may have occurred,” Sen. Richard Blumenthal, D-Conn., a member of the Senate Veterans’ Affairs Committee, said on CBS’s “Face the Nation.”

Rep. Adam Kinzinger, R-Ill., a veteran of the wars in Afghanistan and Iraq, agreed. “Department of Justice needs to get involved,” he said on the same program.

The VA inspector general is investigating 26 sites to determine whether employees covered up long waits for medical appointments.

But Blumenthal said the inspector general cannot do the job alone, and only the Justice Department can convene a grand jury, if necessary. The inspector general has said that the investigation could lead to criminal charges.

The chairman of the Senate Veterans’ Affairs Committee, meanwhile, signaled that as lawmakers step up oversight of the VA, his committee would look into whether Congress is providing enough funding.

“I suspect we are going to need more funding if we’re going to do justice and provide the high-quality care that veterans deserve,” Sen. Bernie Sanders, I-Vt., said on CNN’s “State of the Union.” He has questioned whether the VA’s goal of scheduling patients within 14 days of desired appointment dates was too ambitious, given its budget.

But Rep. Jeff Miller, R-Fla., chairman of the House Veterans’ Affairs Committee, contended that the current controversy is an “issue of manipulation and mismanagement.”

“If money was the issue, this problem would have been solved a long time ago,” he said on CNN.

The VA budget has been increased, but veterans groups have contended that it hasn’t been increased enough, given new demands for services from aging Vietnam veterans and new veterans from the Iraq and Afghanistan wars.

“When you have 2 million new veterans coming into the system, some with very difficult and complicated problems, I do think we have to take a hard look and see if we have the resources,” Sanders said.