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Before his "America First" national security speech on Monday, President Donald Trump addressed the Amtrak train derailment in Washington state, saying the tragedy reinforces the need for a new infrastructure plan.

At least three people were killed and more than 70 were injured when a high-speed passenger train derailed outside Tacoma, causing several train cars to tumble from a highway overpass.

"Let me begin by expressing our deepest sympathies and most heartfelt prayers to the victims of the train derailment in Washington state," Trump said. "We are closely monitoring the situation and coordinating with local authorities."

"It is all the more reason why we need to start immediately fixing the infrastructure of the United States," he added.

The Trump administration is reportedly preparing a $1 trillion infrastructure effort that is expected to be unveiled in early January.

Washington Gov. Jay Inslee declared a state of emergency after Amtrak train 501 derailed about 7:30 a.m. local time along Interstate 5 as it was leaving the new Tacoma station.

A U.S. official told The Associated Press the death toll is expected to rise and track obstruction is being investigated as a possible cause of the derailment.

The National Transportation Safety Board said a "go-team" is departing from Washington, D.C., to investigate the derailment. The Federal Railroad Administration also tweeted it has investigators en route to the scene.

Watch Trump's remarks above.

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