WATCH: I have no evidence to support wiretapping claims, says White House adviser Kellyanne Conway

Her response was unlikely to tamp down criticism of Mr Trump's tweets earlier this month.

Senior White House adviser Kellyanne Conway said she does not have any evidence to support President Donald Trump's claim that Barack Obama wiretapped Trump Tower phone lines during the election.

Instead, she is pointing to recent revelations about other government surveillance to suggest it was possible Mr Obama used a different technique.