House Republicans are getting their first chance to unravel more details about allegations of undue influence exerted by the Homeland Security Department's No. 2 in three foreign investment visa cases.

Homeland Security Inspector General John Roth is expected to testify Thursday morning before the House Homeland Security Committee. He will be answering questions about his 99-page report that concluded that Deputy Secretary Alejandro Mayorkas improperly intervened in three investor visa cases involving prominent Democrats, including the youngest brother of likely Democratic presidential candidate Hillary Rodham Clinton.

Mayorkas was head of U.S. Citizenship and Immigration Services at the time. The report concluded that Mayorkas' intervention created the appearance of favoritism and special access and caused resentment among career government employees, managers and lawyers.