California deploys National Guard troops — but not to stop immigration

California Gov. Jerry Brown has agreed to send National Guard troops to the U.S.-Mexico border, but not for the reason President Donald Trump has requested. 

Brown says he'll deploy about 400 troops. But not all of them will go to the border, and none will be "enforcing federal immigration laws." Instead, they'll join 250 other National Guard troops tasked with combating drug crimes, gun smuggling and human trafficking.

Related: Trump looks at border wall prototypes

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President Trump visits border wall prototypes amid protests
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President Trump visits border wall prototypes amid protests
US President Donald Trump is shown border wall prototypes in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
People hold signs during a protest while standing in front of the current border fence and near the prototypes of U.S. President Donald Trump's border wall, in Tijuana, Mexico March 13, 2018. The sign on the right reads "Trump, walls can be jumped over". REUTERS/Edgard Garrido
US President Donald Trump inspects border wall prototypes in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
People attach a sign reading "Trump, stop the mass deportations" to the current border fence and near the prototypes of U.S. President Donald Trump's border wall, during a protest in Tijuana, Mexico March 13, 2018. REUTERS/Edgard Garrido
US President Donald Trump's motorcade arrives at the border fence in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
People hold signs reading "No to the wall" and "Trump, put your wall, but in your territory, not in ours", during a protest near the prototypes of U.S. President Donald Trump's border wall, seen behind the current border fence, in Tijuana, Mexico March 13, 2018. REUTERS/Edgard Garrido
US President Donald Trump is shown border wall prototypes with White House Chief of Staff John Kelly (L) in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
A man holds a sign reading "Trump, put your wall, but in your territory, not in ours", during a protest near the prototypes of U.S. President Donald Trump's border wall, seen behind the current border fence, in Tijuana, Mexico March 13, 2018. REUTERS/Edgard Garrido
US President Donald Trump arrives to inspect border wall prototypes in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
People hold signs reading "No to the wall, Trump," and "Trump, we are not enemies of the USA" during a protest near the prototypes of U.S. President Donald Trump's border wall, seen behind the current border fence, in Tijuana, Mexico March 13, 2018. REUTERS/Edgard Garrido
US President Donald Trump speaks during an inspection of border wall prototypes in San Diego, California on March 13, 2018. Donald Trump -- making his first trip to California as president -- warned there would be 'bedlam' without the controversial wall he wants to build on the border with Mexico, as he inspected several prototype barriers. The trip to the 'Golden State' -- the most populous in the country and a Democratic stronghold -- was largely upstaged by his own announcement that he had sacked Secretary of State Rex Tillerson. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Mexican Federal Police officers stand guard the Mexican side of the Mexico-US border in Tijuana, Baja California state, from where prototypes of the border wall, which US President Donald Trump will inspect on the outskirts of San Diego, in the US, are visible on March 13, 2018. Fresh off a cabinet reshuffle, President Donald Trump was headed for Democratic stronghold California on Tuesday to inspect prototypes of the controversial border wall with Mexico that was the centerpiece of his White House campaign. / AFP PHOTO / GUILLERMO ARIAS (Photo credit should read GUILLERMO ARIAS/AFP/Getty Images)
People hold signs reading "Trump, we will not pay for the wall" and "Trump, stop the mass deportations" near the border fence between Mexico and the U.S., in Tijuana, Mexico March 13, 2018. REUTERS/Edgard Garrido
Journalists gather at a rooftop near the US -Mexico border as President Trump is expected to inspect the border wall prototypes built outskirts San Diego, in Tijuana, Baja California State, Mexico, on March 13, 2018. Fresh off a cabinet reshuffle, President Donald Trump was headed for Democratic stronghold California on Tuesday to inspect prototypes of the controversial border wall with Mexico that was the centerpiece of his White House campaign. / AFP PHOTO / GUILLERMO ARIAS (Photo credit should read GUILLERMO ARIAS/AFP/Getty Images)
U.S. police officers use a ladder to climb up a truck parked in front of the prototypes of U.S. President Donald Trump's border wall, on the U.S. side of the current border fence, in Tijuana, Mexico March 13, 2018. REUTERS/Jorge Duenes
An agent faces Mexico while standing by the vehicle of U.S. President Donald Trump at the border near San Diego, California, where Trump reviewed wall prototypes designed to serve as a protective barrier against illegal immigrants, drugs and smuggled weapons, March 13, 2018. REUTERS/Kevin Lamarque
A U.S. Customs and Border Protection (CBP) Border Patrol Agent sits on horseback near U.S. President Donald Trump's motorcade during a tour of U.S.-Mexico border wall prototypes near the Otay Mesa Port of Entry in San Diego, California. U.S., March 13, 2018. REUTERS/Kevin Lamarque
TIJUANA, MEXICO - MARCH 13:Anti-Trump protestors demonstrate on the Mexico side of the border before the arrival of the U.S. President to inspect the prototypes of the proposed border wall on March 13, 2018 in Tijuana, Mexico. (Photo by Wally Skalij/Los Angeles Times via Getty Images)
The motorcade carrying US President Donald Trump drives past a US-Mexico border fence as Trump head for an inspection of border wall prototypes in San Diego, California on March 13, 2018. Donald Trump -- making his first trip to California as president -- warned there would be 'bedlam' without the controversial wall he wants to build on the border with Mexico, as he inspected several prototype barriers. The trip to the 'Golden State' -- the most populous in the country and a Democratic stronghold -- was largely upstaged by his own announcement that he had sacked Secretary of State Rex Tillerson. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Mounted Border Patrol agents are seen as US President Donald Trump inspects border wall prototypes in San Diego, California on March 13, 2018. Donald Trump -- making his first trip to California as president -- warned there would be 'bedlam' without the controversial wall he wants to build on the border with Mexico, as he inspected several prototype barriers. The trip to the 'Golden State' -- the most populous in the country and a Democratic stronghold -- was largely upstaged by his own announcement that he had sacked Secretary of State Rex Tillerson. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US President Donald Trump inspects border wall prototypes in San Diego, California on March 13, 2018. Donald Trump -- making his first trip to California as president -- warned there would be 'bedlam' without the controversial wall he wants to build on the border with Mexico, as he inspected several prototype barriers. The trip to the 'Golden State' -- the most populous in the country and a Democratic stronghold -- was largely upstaged by his own announcement that he had sacked Secretary of State Rex Tillerson. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
US President Donald Trump holds up a poster of before and after photos of a segment of the border wall prototypes with Chief Patrol Agent Rodney S. Scott (R) in San Diego, California on March 13, 2018. / AFP PHOTO / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
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Brown said in a letter: "This will not be a mission to build a new wall. It will not be a mission to round up women and children or detain people escaping violence and seeking a better life. ... Here are the facts: there is no massive wave of migrants pouring into California."

Trump said last week he wanted 2,000-4,000 National Guard troops deployed to the border.

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