A former speaker of the U.S. House of Representatives, Gingrich's lengthy career in government could be an asset to Trump, a New York businessman and political newcomer.
As the No. 2 Republican in House in 1994, Gingrich was the main architect that year of the election victory that gave his party control of Congress for the first time in decades.
After becoming House speaker in 1995, Gingrich forced a showdown with President Bill Clinton over the federal budget that ended in a partial government shutdown. He also started the impeachment drive against Clinton for his affair with White House intern Monica Lewinsky.
But Gingrich's Republicans suffered major losses in the 1998 midterm elections.
Gingrich, 73, has been married three times and has admitted mistakes in his personal life, including cheating on his first and second wives. He has since converted to Catholicism and says he has asked for God's forgiveness.
Gingrich ran unsuccessfully for president in 2012. If chosen and elected, he would be the oldest newly inaugurated vice president.
During a campaign event with Gingrich in Ohio on July 6, Trump said that if he wins the White House, the former speaker would play a role "in one form or another" in his government. (Credit: Getty Images / John Sommers II)