A bipartisan group of 17 senators asked Attorney General Eric HolderEric H. HolderSessions defends Lynch's use of an email pseudonym: 'I have a pseudonym' Holder: Sessions is ‘racially insensitive’ and ‘racially unaware’ Let's start giving media manipulation the attention it deserves 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 BoxerBarbara Boxer recounts harassment on Capitol Hill: ‘The entire audience started laughing’ 100 years of the Blue Slip courtesy Four more lawmakers say they’ve been sexually harassed by colleagues in Congress MORE (D-Calif.), Chris CoonsChristopher (Chris) Andrew CoonsA simple way to make America even greater is fixing our patent system Ensuring that defense agencies will have access to a community of entrepreneurs and innovators McConnell: 'I don't hear much pressure' to pass bill protecting Mueller from Trump MORE (D-Del.), Dick DurbinRichard (Dick) Joseph DurbinQuestions loom over Franken ethics probe GOP defends Trump judicial nominee with no trial experience Democrats scramble to contain Franken fallout  MORE (D-Ill.), Dianne FeinsteinDianne Emiel FeinsteinFive things to know about the elephant trophies controversy The feds need to be held accountable for role in Russia scandal Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (D-Calif.), Al FrankenAlan (Al) Stuart FrankenReport: Conyers settled wrongful dismissal complaint over 'sexual advances' Arianna Huffington denies Franken behaved inappropriately in response to new photos Right way and wrong way MORE (D-Minn.), John KerryJohn Forbes KerryTrump's dangerous Guantánamo fixation will fuel fire for terrorists Tech beefs up lobbying amid Russia scrutiny Overnight Tech: Senate Dems want FCC chief recused from Sinclair merger | Tech rallies on Capitol Hill for DACA | Facebook beefs up lobbying ranks MORE (D-Mass.), Kirsten GillibrandKirsten Elizabeth GillibrandDem: Ex-lawmaker tried to pin me to elevator door and kiss me In Washington and Hollywood, principle is sad matter of timing Mika Brzezinski: Bill Clinton needs to apologize or stop talking MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick Joseph LeahyLawmakers, celebs honor Tony Bennett with Library of Congress Gershwin Prize Dem senator jokes: 'Moment of weakness' led me to share photo comparing Trump, Obama Leahy presses Trump court nominee over LGBTQ tweets MORE (D-Vt.), Bob MenendezRobert (Bob) MenendezSenate ethics panel resumes Menendez probe after judge declares mistrial Judge declares mistrial in Menendez bribery case Menendez jury deadlocked, ordered to keep trying MORE (D-N.J.), Charles SchumerCharles (Chuck) Ellis SchumerJuan Williams: The politics of impeachment Texas Republicans slam White House over disaster relief request Dem rep: Trump disaster aid request is 'how you let America down again' MORE (D-N.Y.), Tom UdallThomas (Tom) Stewart UdallOvernight Cybersecurity: Kushner was contacted about WikiLeaks before election | Tech experts blast Trump's 'extreme vetting' plan | Senate passes defense bill with measure to modernize feds' IT FCC rolls back media regulations in move that critics say benefits Sinclair Overnight Tech: Senate Dems want FCC chief recused from Sinclair merger | Tech rallies on Capitol Hill for DACA | Facebook beefs up lobbying ranks MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseDems in Germany: Trump can't stop clean energy revolution Senate Dems demand answers on Social Security info given to election integrity commission Strange bedfellows on criminal justice reform could offer Trump a legislative win MORE (D-R.I.).

Two Republicans, Scott Brown (Mass.) and Mark KirkMark 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.