The Prime Minister said he wanted to create a "good relationship going forward" with the incoming US President.
Mr Trump met Sir Keir in New York last month before it emerged that Labour staff had campaigned for his rival Kamala Harris.
Some Labour frontbenchers also made personal attacks on the President-elect while in opposition.
Constructive
When Sir Keir was asked whether he was surprised to have got on well with Mr Trump, he said: "No, because my approach is to ensure that I have good relations with leaders across the world.
"The best way to build good relations that are based on trust and respect is face to face.
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
Pressure mounts on Ange as side fail to halt slump
AT LEAST it was only one this time, Ange.
ARNE'S ARMY MARCHING ON
Slot's boys stage fightback surge seven points clear to
No end to City slump after Haaland howler.
NDIAYE BRILLIANCE GIVES TOFFEES MASSIVE POINT
SWING BRIDGE
Fulham end long wait to win at Chelsea - and deserve it
WHITE HAS LITTLER No. 2 IN SIGHTS KP
'Diamond' used to beat Luke's grandad weekly
BAN'S THE MAN
O'Brien star snatches King George glory in a thriller
Ukraine 'must fight for right to join Nato'
VOLODYMYR Zelensky claims Ukraine's membership of Nato is possible, but Kyiv will have to campaign hard to persuade allies to make it happen.
Love and hate...it's a new decade of Call The Midwife
RACISM, civil unrest and romance brings the new series of Call The Midwife into a new decade.
'We'll not let you hound out hunt'
PEOPLE line the streets to show their support for rural sports at traditional Boxing Day hunts as Labour pledges a crackdown.
How diabetes drug could help Alzheimer's patients
OZEMPIC could be key to reducing Alzheimer's disease and slowing the progression to dementia, researchers believe.
