President Donald Trump has chosen Larry Kudlow to be his top economic aide, elevating the influence of a long-time fixture on the CNBC business news network who previously served in the Reagan administration and has emerged as a leading evangelist for tax cuts and a smaller government.
Mr Kudlow said he has accepted the offer, saying the US economy is poised to take off after Mr Trump signed 1.5 trillion dollars worth of tax cuts into law.
"The economy is starting to roar and we're going to get more of that," he said.
Mr Kudlow will join an administration in the middle of a tumultuous remodelling as a wave of White House staffers and top officials have departed in recent weeks.
Mr Trump on Tuesday dumped his secretary of state, former Exxon Mobil chief executive Rex Tillerson.
The famously pinstripe-suited Mr Kudlow would succeed Gary Cohn, a former Goldman Sachs executive who is leaving the post in a dispute over Mr Trump's decision to impose tariffs on imported steel and aluminium.
With Mr Trump's tax cuts already being implemented, Mr Kudlow would be advising a president who appears increasingly determined to tax foreign imports, a policy Mr Kudlow personally opposes.
Mr Kudlow said he is "in accord" with Mr Trump's agenda and his team at the White House would help implement the policies set by the president.
Mr Trump has promised to reduce the trade imbalance with China and rewrite the North American Free Trade Agreement with Canada and Mexico.
Mr Kudlow declined to say what advice he would give the president on trade issues, saying instead that Mr Trump is "a very good negotiator".
Mr Kudlow, 70, has informally advised the Trump administration in the past and he has spoken with the president "at some length in recent days," so he is ready "to hit the ground running".
Mr Kudlow told CNBC on Wednesday that he will be going to Washington on Thursday to meet with Mr Trump.