The senators filed a legislative amendment last week that would stop contracts, loans and other funds from going to the Institute of Microelectronics until the FBI gets "full access" to the probe's findings.

WSJ: Singapore Probe Becomes Point of Dispute With U.S.

He said he would push to get access to any material he considers essential for the House probe.

CNN: White House, Burton Agree On Documents

But that isn't likely now because any settlement of the tax probe is complicated by U.S. negotiations with Swiss authorities over U.S. demands for access to client information.

WSJ: HSBC Nears Accord With U.S. in Laundering Probe