A bipartisan group of 17 senators asked Attorney General Eric HolderEric H. HolderOvernight Tech: Uber CEO resigns | Trump's Iowa tech trip | Dems push Sessions to block AT&T-Time Warner deal | Lawmakers warned on threat to election systems | Uber CEO Travis Kalanick resigns Holder mulling 2020 bid MORE on Thursday to begin tracking hate crimes against Sikh-Americans in the wake of this month's attack in Wisconsin that killed six and wounded four people at a Sikh temple.

Their letter to Holder argued that while the Hate Crime Statistics Act requires the Justice Department to track religious crimes against people of other religions on incident report forms, it does not require any tracking of crimes against Sikhs.

"That form allows a law enforcement officer to denote that a crime was motivated by a bias against Jews, Catholics, Protestants, Muslims, or atheists, among others," they wrote. "The form does not allow an officer to denote that a crime was motivated by a bias against Sikhs.

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"Until we have a more comprehensive understanding of the number and type of hate crimes committed against Sikhs, our law enforcement agencies will not be able to allocate the appropriate level of personnel and other resources to prevent and respond to these crimes," they added. "We urge you to take prompt action to ensure that hate crimes against Sikhs are recorded and tracked."

The letter was signed by 15 Democrats: Sens. Jeff Bingaman (D-N.M.), Richard BlumenthalRichard BlumenthalOnly Congress can enable drone technology to reach its full potential Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Dems urge Sessions to reject AT&T-Time Warner merger MORE (D-Conn.), Barbara BoxerBarbara BoxerTime is now to address infrastructure needs Tom Steyer testing waters for Calif. gubernatorial bid Another day, another dollar for retirement advice rip-offs MORE (D-Calif.), Chris CoonsChris CoonsFuneral for the filibuster: GOP will likely lay Senate tool to rest Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Overnight Tech: Uber CEO resigns | Trump's Iowa tech trip | Dems push Sessions to block AT&T-Time Warner deal | Lawmakers warned on threat to election systems | MORE (D-Del.), Dick DurbinDick DurbinGraham gets frustrated in public ‘unmasking’ debate Senate Dems set principles for potential budget negotiation Dem senator: GOP's healthcare approach will 'devastate Medicaid' MORE (D-Ill.), Dianne FeinsteinDianne FeinsteinGraham gets frustrated in public ‘unmasking’ debate Dem senators urged Obama to take action on Russia before election Senate panel questions Lynch on alleged FBI interference MORE (D-Calif.), Al FrankenAl FrankenOvernight Energy: Trump moves to repeal Obama water rule GOP senator calls for tight scrutiny on AT&T's proposed Time Warner merger Howard Stern: I have a 'man crush' on Al Franken MORE (D-Minn.), John KerryJohn KerrySenate GOP healthcare plan is the next man-made disaster Changing America: America’s growing education divide Speaker Ryan, the fate of our policy toward Russia rests in your hands MORE (D-Mass.), Kirsten GillibrandKirsten GillibrandBipartisan senators seek to boost expertise in military justice system Mattis gaining power in Trump’s Cabinet What do Democrats stand for? MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick LeahyEPA head faces skeptical senators on budget cuts A bipartisan consensus against 'big pharma' is growing in Congress Going national with automatic voter registration MORE (D-Vt.), Robert MenendezRobert MenendezBipartisan group, Netflix actress back bill for American Latino Museum The Mideast-focused Senate letter we need to see Taiwan deserves to participate in United Nations MORE (D-N.J.), Charles SchumerCharles SchumerSenate Dems step up protests ahead of ObamaCare repeal vote Senate Dems plan floor protest ahead of ObamaCare repeal vote Dem senator: Don't bet against McConnell on ObamaCare repeal MORE (D-N.Y.), Tom UdallTom UdallOvernight Finance: GOP divided over welfare cuts in budget | Lawmaker loses M on pharma stock he pitched | Yellen: No more financial crises in our lifetimes Overnight Regulation: EPA moves to repeal Obama water rule | Labor chief to review overtime rule | Record fine for Google EPA head faces skeptical senators on budget cuts MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseGraham gets frustrated in public ‘unmasking’ debate Senate panel questions Lynch on alleged FBI interference Judiciary Committee to continue Russia probe after Mueller meeting MORE (D-R.I.).

Two Republicans, Scott Brown (Mass.) and Mark KirkMark KirkGOP senator defends funding Planned Parenthood Why Qatar Is a problem for Washington Taking the easy layup: Why brain cancer patients depend on it MORE (Ill.), also signed the letter.

The letter said the Aug. 5 shooting in Wisconsin is just "the latest hate crime" against Sikhs, and noted several other incidents against Sikhs over the last two years. It also noted a recent survey of more than 1,000 Sikhs in California, in which 10 percent of those surveyed reported that they have been victims of a hate crime.