Gramm became a member of the Senate Banking Committee in 1999, serving as chairman until 2001. He cosponsored the 1985 Gramm–Rudman–Hollings Balanced Budget Act, which sought to reduce the U.S. federal budget deficit. He also supported deregulation, sponsoring the Commodity Futures Modernization Act of 2000 and the Gramm–Leach–Bliley Act. The latter act repealed provisions of the Glass-Steagall Act which had separated banking, insurance, and brokerage activities.
Between 1999 and 2001, Gramm was the chairman of the U.S. Senate Committee on Banking, Housing, and Urban Affairs. During that time he spearheaded efforts to pass banking deregulation laws, including the landmark Gramm–Leach–Bliley Act in 1999, which removed Depression-era laws separating banking, insurance and brokerage activities.
Some economists state that the 1999 legislation spearheaded by Gramm and signed into law by President Clinton—the Gramm–Leach–Bliley Act—was significantly to blame for the 2007 subprime mortgage crisis and 2008 global economic crisis. The Act is most widely known for repealing portions of the Glass–Steagall Act, which had regulated the financial services industry. The Act passed the House and Senate by an overwhelming majority on November 4, 1999.
Gramm lives in Helotes, outside San Antonio, Texas. He is married to Wendy Lee Gramm, a native of Hawaii, who is associated with George Mason University's Mercatus Center in Virginia. They are the parents of two sons: Marshall Gramm, a professor of economics at Rhodes College in Memphis, Tennessee, and Jeff Gramm, who is a money manager, author, and previously a musician in the indie pop band Aden. In 1999, after a bonfire stack collapse at Texas A&M University that resulted in 12 deaths, then-Senator Phil Gramm offered the F-16 flyover reserved for his future funeral as a US senator to be given instead to the Texas A&M community. The offer was accepted and a memorial flyover for the 12 killed was flown at a Texas A&M football game on November 26, 1999.