Republicans have been joining the conversation.

Some state GOP lawmakers in Michigan, which allows medical usage, are considering allowing personal possession through legislative action instead of a statewide initiative.

The reasoning, reports the Detroit News, are fears the measure would boost Democratic turnout in November.

And former Republican Speaker of the House John Boehner surprised political observers last week when he joined the advisory board of Acreage Holdings, one of the nation's largest cannabis corporations, saying \"my thinking on cannabis has evolved\" and that he now supports changing federal marijuana policy.

There are those who oppose legalization.

Kevin Sabet, the president of Smart Approaches to Marijuana, an anti-legalization group said science should guide policy.

“We need to slow this train down, we need to people before profit,” he said a press conference at the National Press Club on Friday. “And we need to get the science out about the truth about marijuana which every day is hurting more people as this country slides deeper into the legalization, really the commercialization of marijuana.”

“We don’t want to lock people up for using marijuana,” he added. “But to against criminalization isn’t to be for legalization.”

The administration will have ultimate authority on the federal legalization of marijuana as President Donald Trump would have to sign any congressional bill into law or set a federal policy initiative.

Some pro-legalization groups saw hope last month with Sen. Cory Gardner, R-Colo., announced he’d spoken to Trump, who agreed to support states’ rights on the issue.

“Since the campaign, President Trump has consistently supported states’ rights to decide for themselves how best to approach marijuana,” Gardner said in a statement. “Furthermore, President Trump has assured me that he will support a federalism-based legislative solution to fix this states’ rights issue once and for all.

These same groups were worried when, in January, Attorney General Jeff Sessions rescinded a trio of memos from the Obama administration that had a policy of non-interference with states when it came to marijuana use.

Republican Rep. Dana Rohrabacher of California, who is the lead sponsor of the Respect State Marijuana Laws Act, criticized Sessions when the decision was originally made. Rohrabacher has touted his support of marijuana in his competitive re-election campaign in a district that includes a lot of the state’s coastline.

“The attorney general of the United States has just delivered an extravagant holiday gift to the drug cartels,” he said in a statement. “By attacking the will of the American people, who overwhelmingly favor marijuana legalization, Jeff Sessions has shown a preference for allowing all commerce in marijuana to take place in the black market, which will inevitably bring the spike in violence he mistakenly attributes to marijuana itself.”

ABC News’ Cheyenne Haslett contributed to this story.

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