The Prime Minister feels Labour MP Austin Mitchell was "quite wrong" to liken Pfizer to "rapists" in a Twitter post, his official spokesman has told reporters.
Asked if David Cameron thought Mr Mitchell should be disciplined by his party, the spokesman said, "He does think this is something for the Labour Party."
Mr Mitchell's original tweet also suggested Mr Cameron "dare not stop Pfizer because he dare not offend the US in any way".
More top news
Harvey Proctor spoke out after police investigating allegations of historical child sex abuse searched his home.
More than a 100 doors have cropped up at the base of the woodland - but managers say they are threatening the enchanted forest.
Jonny Evans and Papiss Cissé are facing likely bans from the FA after appearing to spit at each other during a Premier League game