A bipartisan group of 17 senators asked Attorney General Eric HolderEric H. HolderPerez wins bid to lead Democratic Party Dems fear divisions will persist after DNC chair election Michael Moore touts Ellison for DNC chair: ‘We need fresh blood’ 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 BlumenthalPoll: Senate should confirm Gorsuch A guide to the committees: Senate Senate Dems ask DHS inspector general for probe of Trump’s business arrangement MORE (D-Conn.), Barbara BoxerBarbara BoxerCarly Fiorina 'certainly looking at' Virginia Senate run Top Obama adviser signs with Hollywood talent agency: report 
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Two Republicans, Scott Brown (Mass.) and Mark KirkMark KirkLeaked ObamaCare bill would defund Planned Parenthood GOP senator won't vote to defund Planned Parenthood The Hill's 12:30 Report 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.