WASHINGTON (AP) — President Barack Obama’s pick to be the No. 2 official at the Homeland Security Department faces tough questioning from lawmakers about an investigation into his role in helping a company, run by former Secretary of State Hillary Rodham Clinton’s brother, to secure a foreign investor visa.

Alejandro Mayorkas, the director of U.S. Citizenship and Immigration Services, was to testify Thursday at his confirmation hearing before the Senate Homeland Security and Government Affairs Committee. His nomination hit a snag Tuesday when The Associated Press first reported that the Homeland Security Inspector General’s Office was investigating Mayorkas’ role in helping secure a foreign investor visa for Tony Rodham’s Gulf Coast Funds Management even after the application was denied and an appeal rejected.

In an email to lawmakers, the IG’s office said "at this point in our investigation, we do not have any findings of criminal misconduct."

Congressional officials briefed on the investigation, who spoke on the condition of anonymity because they were not authorized to release details of the case publicly, said the visa was for a Chinese executive. Homeland Security and Citizenship and Immigration Services have not commented on the investigation.

Rodham’s company said Tuesday it was not aware of the investigation or of any investor visa application being denied.

Oklahoma Sen. Tom Coburn, the top Republican on the Senate Homeland Security and Government Affairs Committee, has called for Mayorkas’ nomination to be put on hold pending the outcome of the IG’s investigation. The committee’s chairman, Sen. Thomas Carper, D-Del., was looking into the case.

The investigation does not appear to have any direct ties to Clinton’s tenure as secretary of state. Nonetheless, any hint of scandal or even the most tangential connection to Clinton, who is a possible 2016 Democratic presidential candidate, is likely to become fodder for Republican super PACs, which have sought to discredit her record while she maintains a lower profile with private speeches and work on a new book.

The international investor visa program run by USCIS, known as EB-5, allows foreigners to get visas if they invest $500,000 to $1 million in projects or businesses that create jobs for U.S. citizens. The amount of the investment required depends on the type of project. Investors who are approved for the program can become legal permanent residents after two years and can later be eligible to become citizens.

Even before the inspector general’s investigation became public, two other congressional officials said several Republican members on the committee had planned to ask Mayorkas for more details about his role in the 2001 commutation by President Bill Clinton of the prison sentence of the son of Horacio Vignali, a Democratic Party donor in Los Angeles.

The officials, who spoke on the condition of anonymity to because they were not authorized to comment by name on the committee’s inquiry, said a background questionnaire submitted to Mayorkas in advance of the hearing pressed him for a detailed accounting of his actions in the weeks before the sentence was commuted on Clinton’s last day in office.

Another of Hillary Rodham Clinton’s brothers, Hugh Rodham, had been hired by Horacio Vignali to lobby for the commutation for his son, Carlos, who was serving a 15-year sentence for his conviction on three federal drug charges.

Mayorkas, who was a U.S. attorney in California at the time, told lawmakers during his 2009 confirmation hearing to head USCIS that "it was a mistake" to have talked to the White House about the request. The congressional officials said Mayorkas acknowledged in recent answers to his questionnaire that he also had telephoned a U.S. attorney in Minnesota at the time to check on the Vignali commutation matter.

The nomination took on new importance earlier this month when Homeland Security Secretary Janet Napolitano announced she would be leaving the department, among the government’s largest with 240,00 employees, in September to take over as president of the University of California.

Should Mayorkas be approved by the Senate, he almost certainly would lead the department until a permanent replacement for Napolitano is chosen. His promotion also would create a new leadership vacancy in a department already facing a leadership vacuum. With Napolitano’s departure, 15 of the department’s 45 top positions will either be filled with an acting official or be vacant altogether.

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Associated Press writer Stephen Braun contributed to this report.

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