President Donald Trump says he will demand an inquiry into whether his election campaign was infiltrated for political purposes.

In a tweet, Trump said he wanted to know whether his predecessor's administration ordered such a move.

The request, which will be made officially tomorrow, comes after US media reports suggested that the FBI had an informant meeting campaign aides.

There is already an investigation into all aspects relating to the campaign.

Trump's demand came after a series of tweets denouncing a "witch hunt" that, he said, had found no collusion with Russia.

[Source: BBC News]