A bipartisan group of 17 senators asked Attorney General Eric HolderEric H. HolderDOJ warrant of Trump resistance site triggers alarm Venture capital firm sues ex-Uber CEO for fraud Justice Dept. to meet with journalism group on subpoena guidelines 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 (Dick) BlumenthalSenators push FTC to finalize changes to contact lens rule Trump rule change ignites safety debate Blumenthal: ‘No question’ evidence connects Manafort with criminal wrongdoing 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 CoonsWill Congress preserve monopoly power for healthcare lobbyists? Savings through success in foreign assistance Sunday shows preview: Senators tout bill to protect Mueller MORE (D-Del.), Richard DurbinDick DurbinOPINION | DACA helps people achieve the American dream, don't take it away Immigration battlefield widens for Trump, GOP 'Dreamers' deadline looms for Trump MORE (D-Ill.), Dianne FeinsteinDianne FeinsteinTrump's Democratic tax dilemma Feinstein: Trump immigration policies 'cruel and arbitrary' The Memo: Could Trump’s hard line work on North Korea? MORE (D-Calif.), Al FrankenAlan (Al) Stuart FrankenTrump quietly putting his stamp on the courts Grassley shouldn't allow Senate Democrats to block judicial nominees Senate Dems push Trump admin to protect nursing home residents' right to sue MORE (D-Minn.), John KerryJohn KerryCongress needs to assert the war power against a dangerous president Sinclair and 'Big Media': The outrage that caused the outrage Tillerson sets a lost State Department on the right course MORE (D-Mass.), Kirsten GillibrandKirsten GillibrandDon’t let Congress amend the First Amendment Sanders plans to introduce single-payer bill in September Trump considering Giuliani law partner for US attorney in New York: report MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick LeahyImmigration battlefield widens for Trump, GOP Grassley shouldn't allow Senate Democrats to block judicial nominees Trump’s rhetoric and bluster could lose US an ally in Mexico MORE (D-Vt.), Robert MenendezRobert (Bob) MenendezLawmakers target horse meat trade Senators, staff get approval to testify in Menendez corruption trial Trump admin not opposed to new war authorization MORE (D-N.J.), Chuck SchumerCharles SchumerDemocrats urge Trump to condemn Charlottesville violence Melania Trump on Charlottesville protests: 'No good comes from violence' It's time for McConnell to fight with Trump instead of against him MORE (D-N.Y.), Tom UdallTom UdallWhat veterans have to lose in Trump’s national monument review Overnight Energy: House passes Russia sanctions deal with oil, gas fix Dem bill would ban controversial pesticide MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseAmerican horses deserve safety, and the SAFE Act Lawmakers target horse meat trade Dems introduce legislation to protect manned aircraft from drones MORE (D-R.I.).

Two Republicans, Scott Brown (Mass.) and Mark KirkMark KirkImmigration critics find their champion in Trump Trump's nominee to lead USAID has the right philosophy on international aid McConnell: Senate to try to repeal ObamaCare next week 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.