A bipartisan group of 17 senators asked Attorney General Eric HolderEric H. HolderOvernight Tech: Senate moving to kill FCC's internet privacy rules | Bill Gates pushes for foreign aid | Verizon, AT&T pull Google ads | Q&A with IBM's VP for cyber threat intel Uber leadership sticking by CEO Top Dems prep for future while out of the spotlight 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 BlumenthalSenators introduce new Iran sanctions Senators demand Pentagon action after nude photo scandal Gorsuch rewrites playbook for confirmation hearings MORE (D-Conn.), Barbara BoxerBarbara BoxerAnother day, another dollar for retirement advice rip-offs Carly Fiorina 'certainly looking at' Virginia Senate run Top Obama adviser signs with Hollywood talent agency: report MORE (D-Calif.), Chris CoonsChris CoonsSenators introduce new Iran sanctions Gorsuch sails on day one, but real test is Tuesday Live coverage: Supreme Court nominee hearings begin MORE (D-Del.), Dick DurbinDick DurbinThe Hill’s Whip List: Where Dems stand on Trump’s Supreme Court nominee Gorsuch rewrites playbook for confirmation hearings Gorsuch: I'm 'sorry' for ruling against autistic student MORE (D-Ill.), Dianne FeinsteinDianne FeinsteinDems get it wrong: 'Originalism' is mainstream, even for liberal judges Human rights leaders warn against confirming Gorsuch Feinstein sees slipping support among California voters: poll MORE (D-Calif.), Al FrankenAl FrankenFriends, foes spar in fight on Trump’s Supreme Court nominee Lawmakers share photos of their dogs in honor of National Puppy Day Franken challenges witness endorsement of Gorsuch MORE (D-Minn.), John KerryJohn KerryCongress, Trump need a united front to face down Iran One year ago today we declared ISIS atrocities as genocide Trump’s realism toward Iran is stabilizing force for Middle East MORE (D-Mass.), Kirsten GillibrandKirsten GillibrandSenators demand Pentagon action after nude photo scandal Chelsea Clinton to be honored by Variety, Lifetime Ten years later, House Dems reunite and look forward MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick LeahyDems get it wrong: 'Originalism' is mainstream, even for liberal judges Live coverage: Day three of Supreme Court nominee hearing Dems land few punches on Gorsuch MORE (D-Vt.), Robert MenendezRobert MenendezCorruption trial could roil NJ Senate race Steve Mnuchin, foreclosure king, now runs your US Treasury Senate Dems move to nix Trump's deportation order MORE (D-N.J.), Charles SchumerCharles SchumerDem to Trump: 'You truly are an evil man' Dem senator: GOP controls all of gov't, so success or failure is on them Trump tweets: We’ll put together a great plan after Obamacare explodes MORE (D-N.Y.), Tom UdallTom UdallDems introduce MAR-A-LAGO Act to publish visitor logs The Hill’s Whip List: Where Dems stand on Trump’s Supreme Court nominee Overnight Tech: FCC chief says media isn't 'the enemy of the people' | Fallout from Comey's testimony | Google apologizes for ads near extremist content | US preps electronics ban on some flights MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseDems introduce MAR-A-LAGO Act to publish visitor logs Under pressure, Dems hold back Gorsuch support The Hill’s Whip List: Where Dems stand on Trump’s Supreme Court nominee MORE (D-R.I.).

Two Republicans, Scott Brown (Mass.) and Mark KirkMark KirkObamaCare repeal bill would defund Planned Parenthood Leaked ObamaCare bill would defund Planned Parenthood GOP senator won't vote to defund Planned Parenthood 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.