Democratic presidential hopefuls are lining up behind a push by Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.) to oppose a New Hampshire law that would require college students be permanent residents to vote.

Shaheen sent a letter on Monday asking 2020 Democratic White House hopefuls to sign a petition opposing the law, which will go into effect in July. It requires out-of-state residents like college students to pay to obtain a state driver’s license and register their cars within 60 days of casting a ballot.

Several 2020 candidates quickly backed Shaheen's effort to build opposition to the state law, which is being challenged in court, arguing it limits who can participate in the crucial early primary that will help shape the crowded Democratic field.

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Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) said on Monday that the New Hampshire law, signed by Gov. Chris Sununu (R) last year, "is intended to disenfranchise college students from."

"The New Hampshire voter suppression law is intended to disenfranchise college students from exercising their right to vote," Harris said in a tweet.

The New Hampshire voter suppression law is intended to disenfranchise college students from exercising their right to vote. I have signed @jeanneshaheen’s petition to oppose this law to send a clear message to students — your vote matters and must be protected. — Kamala Harris (@KamalaHarris) April 22, 2019

Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), another 2020 candidate, added that protecting a student's "right to vote is paramount."

Students are the ones who will have to deal with the decisions lawmakers make for decades to come—protecting their right to vote is paramount. Thank you, @JeanneShaheen, for leading the fight in New Hampshire to protect student voters. I'm proud to support this fight. https://t.co/5TEdIGOZPo — Cory Booker (@CoryBooker) April 22, 2019

Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) and former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) are also throwing their support behind Shaheen, who formerly served as governor of New Hampshire.

O'Rourke called the state law "wrong" and "must be overturned," while Gillibrand said she is supporting "efforts to amend and repeal this bill."

Our democracy is strongest when voters have the freedom to head to the ballot box to make their voice heard. The efforts of @GovChrisSununu to restrict this right for tens of thousands of students is unconscionable. I strongly support efforts to amend and repeal this bill. https://t.co/STta0KDzPa — Kirsten Gillibrand (@SenGillibrand) April 22, 2019

The New Hampshire House passed a bill last month to reverse the new requirements. It still needs to pass the state Senate, which held a hearing on the proposal earlier this month, before it would be sent to Sununu.

"The last time I checked people don’t want to give up their freedom to vote. We could make it even easier if we passed my bill to register every eligible young person when they turn 18!" Klobuchar added.

Currently, New Hampshire law requires that registered voters only prove "domicile" rather than permanent residency. But Republicans have stewed over the state's voter registration laws for years.

Trump, who lost the state to Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE, has claimed that "thousands" of people were brought into the state from Massachusetts to vote in 2016.

"If you look at what happened in New Hampshire, where thousands of people came up and voted from a very liberal part of Massachusetts and they came up in buses and they voted," Trump told The Daily Caller last year.

A months-long investigation by New Hampshire Secretary of State Bill Gardner, a Democrat elected to his post by the Republican-led legislature, and the state's Justice Department found no evidence of widespread fraud.

Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.), who is running for the party's nomination, called the New Hampshire law "wrong."

This law is wrong—plain and simple. We need a constitutional amendment that protects every American citizen's right to vote and get that vote counted. Thank you, @JeanneShaheen for leading the fight. https://t.co/My1srb1DrY — Elizabeth Warren (@ewarren) April 22, 2019



Shaheen, in her letter, argued that the new requirements amount to a "poll tax" that is trying to "subvert voting rights."

"They are being disenfranchised by photo ID requirements, arbitrary challenges to residency, and unfounded allegations of fraud. This new law, by effectively creating a poll tax on college students, is just the latest attempt to undermine Americans’ constitutionally-protected right to vote," Shaheen wrote in the letter to the party's presidential contenders.