Hunter Biden: I've been the target of unrelenting 'Trump attack machine'

Speaking from outside the Capitol on Wednesday, the US president's son, Hunter Biden, denied his father's involvement in his business dealings and refused to appear for a closed-door deposition in defiance of a subpoena from the House Oversight Committee.

After Biden's remarks, the Committee's Chairman, Republican James Comer, reiterated the significance of the investigation, referring to the "troubling evidence" found against him so far.