WASHINGTON (REUTERS) - President Donald Trump on Tuesday (Feb 27) named political strategist Brad Parscale as manager of his 2020 presidential re-election campaign, rewarding a digital expert who was critical to Trump's 2016 victory and who is trusted by the Trump family.

In a statement, the Trump campaign said it planned to use Parscale's talent to help Republicans in the 2018 congressional elections in November as they try to hold on to control of the US Congress.

Trump, 71, had already signalled plans to run for re-election, filing a letter of intent with the Federal Election Commission on Jan 20, 2017, the day he took office.

He frequently relives his improbable 2016 victory in speeches and interviews.

Parscale, 42, based in San Antonio, Texas, was the Trump campaign's digital director in 2016 and had performed digital duties for Trump's businesses, the Trump Organisation, before the campaign.

The campaign statement included supportive statements from Trump's son, Eric Trump, and son-in-law and senior adviser, Jared Kushner.

"Brad is an amazing talent and was pivotal to our success in 2016. He has our family's complete trust and is the perfect person to be at the helm of the campaign," said Eric Trump.

Republicans face challenges in trying to retain control of the US House of Representatives and the Senate.

Typically, the party in control of the White House loses seats in the first election after a new president takes over.

In a speech to the Conservative Political Action Conference last Friday, Trump urged conservative activists not to be complacent in 2018.

"We have to get out there and we have to fight in '18 like never before," he said.