The World: New York - Broadcasters say Obama has cost them $30m

Executives at the four major broadcast networks in the US are reported to be growing more and more frustrated with Barack Obama, who they say has cost them around $30 million in cumulative advertising revenue with his primetime news conference pre-emptions.

The White House's repeated requests for prime airtime has already forced Fox to opt against covering one such press conference, as it believed that no urgent breaking news was going to be discussed.

Although Obama has boosted network ratings by appearing on shows such as CBS's 60 Minutes, his addresses do not regularly draw the number of viewers that broadcasters could potentially attract during primetime.