His tweets have the power to shape international relations, send stock prices up β€” or down β€” 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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Fuming over failure of Obamacare repeal, Trump threatens to end federal health insurance subsidies

Frustrated by the failure of the Obamacare repeal in the Senate, President Trump on Saturday threatened to end federal subsidies for healthcare insurance – for Congress as well as the rest of the country.

Such a move could cause havoc and much higher premiums in insurance markets, since many low- and moderate-income people depend on those subsidies to help cover the cost of their policies. Through a series of administrative maneuvers by Congress and the Obama administration, members and their staffs also benefit from those subsidies.

Targeting congressional healthcare might score Trump some populist points with his base, but it would likely come at a cost of poisoning his relationship with Congress. Just making the threat on Saturday highlights how far things have eroded between Trump and top GOP lawmakers.

And it comes a day after Trump pushed out former Chief of Staff Reince Priebus, an establishment Republican who was the GOP congressional leadership's trusted liaison in the White House.

Trump threatens to let the Affordable Care Act fail. Can he?>>

Trump's longstanding threat to let the health insurance plans fail would come with its own political price. The federal government sends about $600 million a month to insurance companies to help cover the cost, and Trump is threatening to cut that off to allow Obamacare markets to collapse.

His goal is to pressure Congress to send him a repeal bill, but so far the strategy has failed. The confidence Trump has expressed that if he followed through with the threat the fallout would land not on him but on Democrats, because they created Obamacare, is not widely shared in Washington.

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