Rebekah Brooks sent a text message to David Cameron telling him "professionally we are all in this together" the Leveson

Inquiry has heard.

In the message from the former News International (NI) chief executive - among a clutch handed over to the probe into press

ethics by NI - she also said she was "rooting for him" on the eve of a major speech to the Conservative Party conference in 2009.

The text was read out by the inquiry's counsel Robert Jay QC as he grilled the Prime Minister about his close friendship with

former Sun editor Mrs Brooks.

Sent just days after The Sun switched its support to his party from Labour, it said: "I'm so rooting for you tomorrow not just as a proud friend but because professionally we are in this together. Speech of your life? Yes he Cam!"

Asked to explain the message, Mr Cameron said: "The Sun had made this decision to back the Conservatives, to part company with Labour.

"The Sun wanted to make sure it was helping the Conservative Party put its best foot forward with the policies we were

announcing, the speech I was making. That's what that means."

He went on: "We were friends. But professionally, me as leader of the Conservative Party, her in newspapers, we were going to be pushing the same political agenda."

His grilling under oath at the Royal Courts of Justice also focused on the appointment of Andy Coulson as Downing Street spin chief.