However, Ms. May did not respond when Labour Party Leader Jeremy Corbyn asked her to condemn "the comments of President Trump's trade adviser saying that, and I quote, there's a special place in hell for Justin Trudeau?".
Canadian Prime Minister Justin Trudeau then "acts hurt when called out!"
"We don't want to stand alone in the world", Feinstein said on CNN's State of the Union.
A Trump adviser had suggested Sunday that Trump saw Trudeau as trying to weaken his hand before the meeting with Kim.
President Donald Trump's chief economic adviser Larry Kudlow and his trade adviser Peter Navarro blasted Canadian Prime Minister Justin Trudeau on Sunday for "betraying" the United States and engaging in "bad faith diplomacy" at this week's fractious G7 summit.
The president's call to eliminate trade barriers came as tensions build between the United States and its allies after the Trump administration imposed steep tariffs on steel and aluminum imports from the European Union, Canada and Mexico.
Even Hollywood actor Robert de Niro was weighing in.
The announcement put Trump in a rage and he branded the Canadian PM as "dishonest and weak" and accused him of stabbing the U.S.
And on Twitter, the hashtag #ThanksCanada was trending with Americans thanking their neighbours to the north for everything from Nanaimo bars to hockey to caring for airline passengers during 9/11.
Mr Trump's advisers said the United States president believed he had been stabbed in the back by Mr Trudeau over U.S. tariffs.
How France could bypass Paul Pogba
And Petit has challenged him to repeat his match-winning performance that buried fierce rivals Manchester City at the Etihad in April.
The group managed a common statement in which they agreed to disagree on some issues, only to have Trump disavow the document in a tweet after leaving the meeting.
But Sen. Lindsey Graham (R-S.C.) said Sunday on ABC's "This Week", "I'm not so sure John's right about where America is on trade".
In response to initial tweets critical of her country and prime minister, Canada's foreign minister, Chrystia Freeland, said her nation "does not conduct its diplomacy through ad hominem attacks".
The president said he was annoyed by Trudeau's comments about not letting Canada get pushed around.
Trump agreed with the language in the communique from the summit in Canada Friday and Saturday, but took offense at criticism of USA tariffs by Canadian Prime Minister Justin Trudeau at his news conference after Trump left early.
He has threatened to use national security laws to do the same for foreign auto imports and has walked back on environmental agreements and an global deal to prevent Iran from building a nuclear bomb.
Trump announced after Trudeau's press conference that the USA would not sign onto the G-7 communique.
Two points of the joint communique formulated by the G7 members were not negotiated with the USA president, but that didn't prevent the Canadian prime minister from announcing that all member-states had reached common ground on the final statement.
In retaliation, all three allies vowed to impose retaliatory tariffs on scores of USA products.
"International cooperation can not depend on being angry and on sound bites".
French President Emmanuel Macron, in a statement: "We spent two days to obtain a text and commitments".