A bipartisan group of 17 senators asked Attorney General Eric HolderEric Himpton HolderPavlich: The claim Trump let the mentally ill get guns is a lie Pennsylvania Supreme Court releases new congressional map 36 people who could challenge Trump in 2020 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 Blumenthal (D-Conn.), Barbara BoxerBarbara Levy BoxerKamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response Billionaire Steyer to push for Dem House push MORE (D-Calif.), Chris CoonsChristopher (Chris) Andrew CoonsAfter Florida school shooting, vows for change but no clear path forward Democrats put Dreamers and their party in danger by playing hardball Sunday shows preview: Russian charges, Florida shooting dominate coverage MORE (D-Del.), Dick DurbinRichard (Dick) Joseph DurbinAmerica’s waning commitment to the promise of the First Amendment Senate rejects Trump immigration plan What to watch for in the Senate immigration votes MORE (D-Ill.), Dianne FeinsteinDianne Emiel FeinsteinLawmakers feel pressure on guns Feinstein: Trump must urge GOP to pass bump stock ban Florida lawmakers reject motion to consider bill that would ban assault rifles MORE (D-Calif.), Al FrankenAlan (Al) Stuart FrankenShould the Rob Porter outcome set the standard? Grassley, Dems step up battle over judicial nominees Sen. Gillibrand, eyeing 2020 bid, rankles some Democrats MORE (D-Minn.), John KerryJohn Forbes Kerry2020 Dem contenders travel to key primary states When it comes to Colombia, America is in a tough spot 36 people who could challenge Trump in 2020 MORE (D-Mass.), Kirsten GillibrandKirsten Elizabeth GillibrandAmerican women will decide who wins and loses in 2018 elections Dems ponder gender politics of 2020 nominee Calls mount from Dems to give platform to Trump accusers  MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick Joseph LeahyGrassley, Dems step up battle over judicial nominees Popular bill to fight drug prices left out of budget deal Judiciary Dems want public hearings with Kushner, Trump Jr. MORE (D-Vt.), Robert MenendezRobert (Bob) MenendezJustice Dept intends to re-try Menendez in corruption case DACA is neither bipartisan nor in America's interest Senate DACA deal picks up GOP supporters MORE (D-N.J.), Charles SchumerCharles (Chuck) Ellis SchumerDemocrats now attack internet rules they once embraced Schumer: Trump budget would ‘cripple’ gun background checks Schumer: Senate Republicans' silence 'deafening' on guns, Russia MORE (D-N.Y.), Tom UdallThomas (Tom) Stewart UdallCongress fails miserably: For Asian-Americans, immigration proposals are personal attacks Senate rejects centrist immigration bill after Trump veto threat Dem senators want list of White House officials with interim security clearances MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseCommittee chairman aims for House vote on opioid bills by Memorial Day Regulators seek to remove barriers to electric grid storage Prison sentencing bill advances over Sessions objections MORE (D-R.I.).

Two Republicans, Scott Brown (Mass.) and Mark KirkMark Steven KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns 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.