US President Donald Trump on Wednesday called on Venezuela to free jailed opposition leader Leopoldo Lopez "immediately," posting a picture of himself and Vice President Mike Pence with Lopez's wife.

"Venezuela should allow Leopoldo Lopez, a political prisoner & husband of @liliantintori (just met w/ @marcorubio) out of prison immediately," Trump tweeted, along with the photo, which also features Florida Senator Marco Rubio.

Lopez, the founder of Popular Will, one of the most hardline of the parties opposing Venezuelan President Nicolas Maduro, is serving a 14-year prison term on charges of inciting unrest at anti-government protests that left 43 people dead in 2014.