Endorsement puts former US president at odds with social conservatives but in line with majority of American public.

Former US President Donald Trump has said he will support a ballot measure in the southern state of Florida that would legalise marijuana for people over the age of 21.

In a social media post on Monday, the Republican presidential nominee said that as president he would support state-level efforts to decriminalise and regulate marijuana, as well as research into the drug’s potential medical applications.

“As I have previously stated, I believe it is time to end needless arrests and incarcerations of adults for small amounts of marijuana for personal use,” Trump said. “We must also implement smart regulations, while providing access for adults, to safe, tested product. As a Floridian, I will be voting YES on Amendment 3 this November.”

Trump also said he would work with the US Congress to pass “common sense” laws around the issue, including safe banking for state-authorised marijuana vendors.

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