The White House on Wednesday is expected to announce that President Obama intends to nominate Alastair Fitzpayne as the next assistant secretary of Treasury for legislative affairs, according to a White House official.

Fitzpayne has been Treasury's deputy chief of staff since January 2009, and has also served as a House and Senate staffer. He was a legislative assistant to former Sen. Evan Bayh (D-Ind.) from 2001 to 2006.

From 2007 to 2009, he served as a senior policy adviser to Rep. Rahm Emanuel (D-Ill.), who later became chief of staff to President Obama and now is mayor of the city of Chicago.

—This story was updated at 3:03 p.m. to clarify that the White House is expected to make this announcement, not Treasury.