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A now-deleted tweet from @ALT_USCIS was included in a complaint Twitter filed against the Department of Homeland Security. Twitter says DHS tried to unmask the user behind this account, which has "expressed dissent in a range of different ways," including this early tweet that "the author apparently believed cast doubt on the Administration's immigration policy." Twitter/U.S. District Court Northern District of California hide caption

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Twitter/U.S. District Court Northern District of California

A view of a ballot scanner at a New York City Board of Elections voting machine facility warehouse just before last November's election. Drew Angerer/Getty Images hide caption

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Drew Angerer/Getty Images

State And Local Officials Wary Of Federal Government's Election Security Efforts

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Immigration and Customs Enforcement officers escort a man who was arrested in a New York City apartment building. New York is a city that won't detain noncitizens on behalf of the federal government. Richard Drew/AP hide caption

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Richard Drew/AP

President Trump salutes as he disembarks Marine One on the South Lawn of the White House on Sunday. Trump signed a new executive order on travel and refugee resettlement on Monday. Erik S. Lesser/Pool/Getty Images hide caption

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Erik S. Lesser/Pool/Getty Images

Las Vegas Metropolitan Police Department K-9 officers search the Jewish Community Center of Southern Nevada after an employee received a suspicious phone call that led about 10 people to evacuate the building on Feb. 27. Jewish institutions across the nation have received more than 120 bomb threats in the past two months Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images

DHS To Help Jewish Community Centers Enhance Security Protocols

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U.S. Immigration and Customs Enforcement arrested 680 people during the first week of February. The memos call for 10,000 more ICE officers and agents as well as 5,000 more agents at U.S. Customs and Border Protection. Bryan Cox/ICE via AP hide caption

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Bryan Cox/ICE via AP

Guadalupe García de Rayos, shown here outside the Phoenix office of Immigration and Customs Enforcement, was deported after more than two decades of living in the U.S. Matthew Casey/KJZZ hide caption

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Matthew Casey/KJZZ

Lorenzo Palma (center) reviews family documents with his brother and mother in their home in El Paso, Texas. Palma served time for a parole violation and, just as he was being released, was sent before an immigration court to prove his U.S. citizenship. Bree Lamb for NPR hide caption

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Bree Lamb for NPR

Retired Marine Corps Gen. John Kelly (right) has been tapped by President-elect Donald Trump to lead the Department of Homeland Security. The two are shown here before their meeting at Trump International Golf Club last month in Bedminster Township, N.J. Drew Angerer/Getty Images hide caption

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Drew Angerer/Getty Images

Russian President Vladimir Putin listens during the opening session of the newly elected State Duma, Russia's lower house of parliament, in Moscow. The U.S. blamed the Russian government for the hacking of American political sites and accused Moscow of trying to interfere with the upcoming presidential election. Alexei Nikolsky/AP hide caption

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Alexei Nikolsky/AP

The U.S. government has mistakenly granted citizenship to at least 858 immigrants who had pending deportation orders from countries of concern to national security or with high rates of immigration fraud. Susan Walsh/AP hide caption

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Susan Walsh/AP

House Homeland Security Chairman Rep. Mike McCaul, R-Texas speaks on Capitol Hill in Washington, in March. McCaul said one security threat to the pope had been "disrupted" and that the U.S. remains vigilant for others. Lauren Victoria Burke/AP hide caption

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Lauren Victoria Burke/AP

Senate Majority Leader Mitch McConnell has offered Democrats a Department of Homeland Security funding bill without provisions, but Democrats still want a commitment from House Speaker John Boehner. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

President Obama, joined by Homeland Security Secretary Jeh Johnson (left), delivers remarks at the National Cybersecurity and Communications Integration Center on Jan. 13 in Arlington, Va. Obama discussed efforts to improve the government's ability to collaborate with industry to combat cyber threats. Kristoffer Tripplaar-Pool/Getty Images hide caption

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Kristoffer Tripplaar-Pool/Getty Images

As Homeland Security Steps Up Cybercrime Fight, Tech Industry Wary

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