Lynton Crosby, whose lobbying firm is reported to have worked for tobacco giant Philip Morris, said any suggestion he had used his position as an adviser improperly was "simply false".
In a statement issued today by his company CTF Partners, Crosby said:
The Prime Minister has repeatedly and clearly said that I have never lobbied him on anything, including on the issue of tobacco or plain packaging of cigarettes.
What the PM said should be enough for any ordinary person but to avoid any doubt or speculation, let me be clear.
At no time have I had any conversation or discussion with or lobbied the Prime Minister, or indeed the Health Secretary or the health minister, on plain packaging or tobacco issues.
Indeed, any claim that I have sought to improperly use my position as part-time campaign adviser to the Conservative Party is simply false.
More top news
Windy and wet weather to end the month of May
They made it across a deadly sea this year, but their journey to what they hope will be political asylum had only just begun.
Scientists used modern forensic techniques to review the 'cold case' and determine the victim was probably killed by two blows to the head.