His tweets have the power to shape international relations, send stock prices up — or down — and galvanize the American public.

We're watching how Donald Trump is using this platform of unfettered communication now that he’s commander in chief. Here is everything Trump has tweeted since he was sworn in as 45th president of the United States. In many cases, we look at what he was reacting to and whether what he said was accurate. And, as much as possible, we'll relate what else was going on at the time. Check back for more as Trump continues to tweet.

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Domestic policyImmigrationObama

Trump blames lax immigration enforcement for rise of 'bad MS-13 gangs'

Led by President Trump, top administration officials on Tuesday blamed what they called lax immigration enforcement for the rise of MS-13, the bloody crime cartel spawned in the streets and jails of Los Angeles, and promised a stronger federal response.

MS-13 was founded in Los Angeles in the 1980s by immigrants fleeing a civil war in their native El Salvador, and it has expanded in scope and violence ever since.

An FBI task force has investigated the transnational crime group since 2007, working with law enforcement in El Salvador, Honduras and Guatemala. In 2008, before Obama was elected, the FBI said MS-13 was active in at least 42 states.

In separate speeches Tuesday, Atty. Gen. Jeff Sessions and Homeland Security Secretary John F. Kelly both vowed to take a tougher approach to such cartels, but offered few details as to what that would entail.

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