Donald Trump has said a conspiracy theory alleging Melania Trump sometimes uses a body double during outings with him has been concocted by journalists doctoring images.

“The Fake News photoshopped pictures of Melania, then propelled conspiracy theories that it’s actually not her by my side in Alabama and other places,” he tweeted, without providing evidence.

“They are only getting more deranged with time!”

The US president’s outburst came after some social media users suggested the First Lady looked different during the couple’s recent visit to Alabama to pay their respects to 23 victims who died in a tornado.

“I see unconvincing Melania stunt-double is back,” one Twitter user wrote over the weekend, alongside an image showing Ms Trump in dark sunglasses and holding the president’s hand.

US president Donald Trump and first lady Melania Trump in Alabama (Nicholas Kamm/AFP/Getty)

Claims Ms Trump has used a body double first surfaced in late 2017 during an appearance at a press conference alongside her husband. She again partially obscured her face by wearing large, dark sunglasses.

On Tuesday, Ms Trump issued an angry response through her spokesperson to ABC, after a segment on daytime talk show The View made fun of the ongoing conspiracy.

“Some people think the first lady is using an impostor to stand in for her,” co-host Joy Behar said. “You mean there are two women who have to pretend they’re listening to (President Trump)?”

Criminals who worked for Trump Show all 5 1 /5 Criminals who worked for Trump Criminals who worked for Trump Michael Cohen Former lawyer for Donald Trump was sentenced to three years in prison on counts involving evading income tax, false disclosure of the hush money paid to Stormy Daniels and another hush money charge Getty Criminals who worked for Trump Paul Manafort Former campaign manager for Trump Manafort was found guilty in February 2018 of five counts of tax fraud, two counts of bank fraud and one count of failure to disclose a foreign bank account. The crimes occurred prior to his appointment in Trump's campaign Getty Criminals who worked for Trump George Papadopoulos Former Trump campaign adviser Papadopoulos pleaded guilty to lying to the FBI in October 2017. He had lied about making contact with a professor who claimed that the Russians had dirt on Hillary Clinton. He was sentenced to 14 days in jail Getty Criminals who worked for Trump Michael Flynn Former White House National Security adviser Michael Flynn pleaded guilty to lying to the FBI in December 2017. He had lied about conversations that he had with the Russian ambassador to the US during Trump's Presidential campaign. He was not given prison time due to his "significant assistance" to the Mueller investigation Getty Criminals who worked for Trump Rick Gates Deputy chairman of Trump's presidential campaign Gates pleaded guilty to lying to the FBI in February 2018 AFP/Getty

Stephanie Grisham, Ms Trump’s representative, responded in an email to ABC it was “sad” the female presenters “spend so much time attacking another woman, whose only goal is to help children”.

The unfounded rumour had echoes of another conspiracy involving Ms Trump last summer, after she failed to make a public appearance in more than three weeks.

Her temporary disappearance sparked a deluge of rumours and theories, until the White House announced she had been recovering from surgery.