London , England ( CNN ) -- British Prime Minister David Cameron will discuss BP , whose leaking well has caused the worst oil spill in U.S. history , when he speaks by phone with U.S. President Barack Obama this weekend , Cameron 's office at Downing Street said Friday . It will be a `` routine call '' and BP will be one of several issues they discuss , Downing Street said , without providing more information . The phone call follows concern about anti-British rhetoric from Obama and others in America about BP 's role in the disaster . London Mayor Boris Johnson said the remarks are `` slightly worrying '' and Piers Morgan , a British TV host and former newspaper editor , said Obama seems to be on `` an absolute witch hunt '' against the BP boss . `` You know , accidents do happen , '' Morgan told CNN 's `` Connect the World '' on Thursday night . `` There are major issues in terms of safety here , in terms of environmental tragedy that 's going on where this spillage is occurring , but I think simply to demand the guy 's head on a plate when he 's trying to fix it is not sensible politics , and it 's slightly self-serving . `` And I , if I was Barack Obama , would cool the rhetoric . I would n't make it a British thing , because BP is not a British company anymore , they are an international company . And it 's looking to me a little like Brit-bashing . '' Johnson told BBC Radio 4 on Thursday he wants to see `` cool heads and a bit of calm reflection '' about the problem , `` rather than endlessly buck-passing and name-calling . '' He said many British pension funds are exposed to BP and could be at risk if the company 's share price plummets . `` I do think that it starts to become a matter of national concern if a great British company is being continually beaten up on the international airwaves , '' he said , adding that the disaster is the result of an accident that BP is trying to remedy . `` Ultimately ( BP ) can not be faulted because , I 'm sorry , it was an accident that took place , and BP , I think , is paying a very , very heavy price indeed . '' Obama said earlier this week that he was talking with experts about the oil disaster so `` I know whose ass to kick . '' U.S. Rep. Anthony Weiner , D-N.Y. , who sits on the House Energy and Commerce Committee , said BP was probably lying in its comments about the spill . `` Here 's a viewer 's guide to BP media briefings : Whenever you hear someone with a British accent talking about this on behalf of British Petroleum , they are not telling you the truth , '' Weiner told MSNBC this week . `` I think we as a government have been giving them too much credence for the things they 've been saying , '' Weiner said . `` Just about everything they 've said at some point has turned out to be wrong . So every time they say they 're doing something , your first instinct should be , it just ai n't true . '' U.S. State Department spokesman P.J . Crowley denied Thursday that Obama or the United States is `` Britain-bashing '' and said it would probably be a topic the president discusses with Cameron on the phone . He said there are certain to be `` ripple effects '' as America demands that BP live up to its responsibilities to clean up the spill . `` The British people understand the frustration and anger that the American people are seeing in this , '' Crowley said . `` It is not going to affect our relationship between the United States and Britain . '' Crowley said the United States understands `` the importance that BP has within British society and the British economy ... but this is ultimately about a private company and its responsibility in light of what 's happened in the Gulf . ''
Cameron , Obama to discuss BP in phone call this weekend . Call follows British concerns about ` ` Brit - bashing '' over oil disaster . Piers Morgan says Obama on ` ` witch hunt '' against his government . London mayor says Obama to ` ` by - passing and name - calling '' State Department spokesman denies ' Britain - bashing '