Congress moved to protect medical marijuana by including in its stop-gap federal spending bill a provision barring the Justice Department from using federal funds to go after the drug in states where medical marijuana is legal, but now, President Trump says that doesn't matter.

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Even though Trump signed the spending bill into law last Friday, he included a signing statement objecting to numerous provisions in the bill—including the ban on funds to block the implementation of medical marijuana laws in those states.

Despite those state laws, marijuana remains illegal under federal law, which also does not recognize "medical marijuana."

The president said he reserved the right to ignore that provision and left open the possibility the Trump administration could go after the 29 states, the District of Columbia, and the territories of Guam and Puerto Rico where medical marijuana use is allowed.

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"Division B, section 537 provides that the Department of Justice may not use any funds to prevent implementation of medical marijuana laws by various States and territories," Trump noted in the signing statement. "I will treat this provision consistently with my constitutional responsibility to take care that the laws be faithfully executed."

The language suggests that Trump could give Attorney General Jeff Sessions his head when it comes to enforcing marijuana policy. Sessions has vowed to crack down on marijuana and has scoffed at arguments for its medical use as "desperate."

"I reject the idea that we're going to be better placed if we have more marijuana," Sessions told law enforcement officials in an April speech. "It's not a healthy substance, particularly for young people."

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But the language also sets up a potential power struggle with Congress, which, under the Constitution, has the sole power to appropriate funds for federal government operations.

As Steve Bell, a senior adviser at the Bipartisan Policy Center in Washington told Bloomberg News, the signing statement signals a desire to usurp power from Congress.

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"It is the constitutional prerogative of the Congress to spend money and to put limitations on spending," said Bell, a former staff director of the Senate Budget Committee and an aide to former Republican Senator Pete Domenici of New Mexico. "This is an extremely broad assertion of executive branch power over the purse."

Medical marijuana providers in states where it is legal thought they had some protection, thanks to the congressional budget action, but in typical Trumpian fashion, the president's signing statement has once again introduced chaos, doubt and uncertainty, leaving at risk not only patients and providers, but also traditional limits on executive authority.