Republican lawmaker pledges to investigate Trump's wiretapping claims

A senior Republican lawmaker is pledging to investigate U.S. President Donald Trump's unsubstantiated claim that his predecessor had his phones tapped during the 2016 presidential campaign.

Republican Congressman Devin Nunes, who chairs the House Intelligence Committee, says the probe will be part the investigation already underway into Russia's role in last year's election.

Donald Trump has rocked the political establishment with a series of weekend tweets, in which he accused former president Barack Obama of tapping his phones at Trump Tower- a claim that caught several leading Republicans off guard.

Nina-Maria Potts reports:

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