A bipartisan group of 17 senators asked Attorney General Eric HolderEric Himpton HolderComey's book tour is all about 'truth' — but his FBI tenure, not so much James Comey and Andrew McCabe: You read, you decide Eric Holder headed to New Hampshire for high-profile event 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 BoxerThe ‘bang for the buck’ theory fueling Trump’s infrastructure plan Kamala Harris endorses Gavin Newsom for California governor Dems face hard choice for State of the Union response MORE (D-Calif.), Chris CoonsChristopher (Chris) Andrew CoonsOvernight Defense: Pompeo clears Senate panel, on track for confirmation | Retired officers oppose Haspel for CIA director | Iran, Syria on agenda for Macron visit Pompeo headed for confirmation after surprise panel vote Pompeo lacks votes for positive vote on panel MORE (D-Del.), Dick DurbinRichard (Dick) Joseph DurbinGOP moves to cut debate time for Trump nominees Senators to Trump: Let Mueller finish Russia probe Democrats fret over GOP changes to Mueller bill MORE (D-Ill.), Dianne FeinsteinDianne Emiel FeinsteinOvernight Cybersecurity: DHS cyber nominee vows to make election security 'top priority' | CIA to allow lawmakers to review classified info on Haspel | Dems raise security concerns about Trump's phone use Democrats fret over GOP changes to Mueller bill Feinstein introduces bill allowing DHS to quickly remove 'compromised software' MORE (D-Calif.), Al FrankenAlan (Al) Stuart FrankenFranken to make first public appearance since resignation Overnight Cybersecurity: Fallout from Comey memos | IG reportedly investigating memos over classified info | DNC sues Russia, Trump campaign | GOP chair blasts FDIC over data security Why Smokin' Joe leads the pack of 2020 Democratic hopefuls MORE (D-Minn.), John KerryJohn Forbes KerryPrimary care is a home run for both sides of the aisle Mellman: Memories may be beautiful, yet… Lieberman: Senate should fulfill constitutional duty, confirm Mike Pompeo MORE (D-Mass.), Kirsten GillibrandKirsten Elizabeth GillibrandBudowsky: End the DNC malpractice Overnight Finance: Mulvaney remark on lobbyists stuns Washington | Macron takes swipe at Trump tariffs | Conservatives eye tax cut on capital gains | Gillibrand unveils post office banking bill | GOP chairman pushes banks on gun policies Gillibrand unveils bill to offer banking services at post offices MORE (D-N.Y.), Frank Lautenberg (D-N.J.), Patrick LeahyPatrick Joseph LeahyCongress should build on the momentum from spending bill Overnight Tech: Zuckerberg grilled by lawmakers over data scandal | What we learned from marathon hearing | Facebook hit with class action lawsuit | Twitter endorses political ad disclosure bill | Uber buys bike share Overnight Cybersecurity: Zuckerberg faces grilling in marathon hearing | What we learned from Facebook chief | Dems press Ryan to help get Russia hacking records | Top Trump security adviser resigning MORE (D-Vt.), Robert MenendezRobert (Bob) MenendezSenate must save itself by confirming Mike Pompeo Poll: Menendez has 17-point lead over GOP challenger Russian attacks on America require bipartisan response from Congress MORE (D-N.J.), Charles SchumerCharles (Chuck) Ellis SchumerCan Mueller be more honest than his colleagues? Throwing some cold water on all of the Korean summit optimism House Republicans push Mulvaney, Trump to rescind Gateway funds MORE (D-N.Y.), Tom UdallThomas (Tom) Stewart UdallSchumer rips Trump over 'slap-dash' nominee vetting Dem senators demand Trump explain ties to Koch brothers Dem senators unveil expanded public option for health insurance MORE (D-N.M.) and Sheldon WhitehouseSheldon WhitehouseEPA security chief worked for tabloid owner linked to Trump: report Overnight Energy: Pruitt proposes rule targeting 'secret science' | Dems probe Pruitt's security chief | FAA bill provisions could strip endangered species protections Dems say Pruitt security chief’s authorization for side job is invalid 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.