Gov. Gretchen Whitmer of Michigan, a number one Democrat from a vital battleground state, on Wednesday subtly warned in opposition to President-elect Donald J. Trump’s tariff threats focusing on Canada, at the same time as she pressured her broader willingness to work with him on the cusp of his second inauguration.

Her speech, on the Detroit Auto Present, provided among the many clearest examples but of how Democrats from states that Mr. Trump carried are searching for to steadiness recent overtures to the incoming president with their staunch opposition to a few of his coverage proposals.

Talking at a conference middle simply throughout the Detroit River from Windsor, Ont., Ms. Whitmer described sturdy cultural and industrial ties between the 2 cities.

Utilizing tariffs as punishment, she mentioned, dangers “damaging provide chains, slowing manufacturing traces and slicing jobs on each side of the border.”

Ms. Whitmer didn’t point out Mr. Trump by identify as she broached the topic, however he has threatened to impose tariffs on imports from Canada if the nation doesn’t cut back the stream of migrants and fentanyl to the USA. The Ontario Premier Doug Ford has mentioned retaliation, together with threatening to disrupt the electrical energy provide from the province to the USA.

“I’m not against tariffs outright, however we can’t deal with them like a one-size-fits-all resolution, and we definitely shouldn’t use them to punish our closest buying and selling companions,” Ms. Whitmer mentioned, arguing that such an strategy might embolden China.

“They’d love nothing greater than for us, to look at us cripple America’s auto ecosystem all by ourselves,” she mentioned. “It is a matter of nationwide safety.”

Ms. Whitmer additionally famous that elements of cars usually cross the U.S.-Canada border greater than as soon as within the manufacturing course of. Tariffs imposed every time, she instructed, might imply “you’ll pay extra to purchase a Silverado, repair the engine of your Mustang, or exchange the fender in your Jeep Grand Cherokee.”

The feedback have been a part of a wide-ranging speech about her financial imaginative and prescient and about responding to the challenges and competitors confronting Michigan’s auto business, each internationally and from different states. The broader business accounts for 20 p.c of Michigan’s work power and contributes $304 billion to the state’s economic system yearly, according to the Detroit Regional Chamber.

“We should keep nimble to help companies which are already right here and win new ones, too,” she mentioned. “We are able to’t simply unilaterally disarm, like some on the far left and much proper would have us do.” She instructed Republicans that to really repair the state’s roads, new income could be vital, whereas telling Democrats that “fiscally accountable cuts” have been additionally wanted.

All through, Ms. Whitmer peppered her remarks with guarantees to work on a bipartisan foundation each regionally and nationally, an strategy that has taken on new urgency after Democrats in November misplaced management of the Michigan Home of Representatives.

She additionally prolonged these gestures explicitly to Mr. Trump, who flipped Michigan in November, 4 years after President Biden gained the state.

Noting that Michiganders had twice supported each herself and Mr. Trump, Ms. Whitmer mentioned, they “anticipate us to search out frequent floor.”

Ms. Whitmer’s feedback stood in distinction to the extra combative stances that elected officers from some deeply Democratic states have taken.

“I don’t wish to fake we’re all the time going to agree, however I’ll all the time search collaboration first,” mentioned Ms. Whitmer, who has clashed for years with Mr. Trump. “I gained’t go on the lookout for fights. I gained’t again down from them both.”

In an interview on Tuesday, Ms. Whitmer mentioned she wished to “redouble my efforts to attach with him after the inauguration.”

“President Trump cares about Michigan, he spent numerous time right here in Michigan and Michigan helped elect him to the White Home,” she mentioned of a person who has usually been described as susceptible to flattery. “I wish to guarantee that we don’t take our eye off the ball and that we’re actually targeted on utilizing tariffs as a scalpel and never a, you realize, a sledgehammer.”

Throughout her speech, Ms. Whitmer walked a cautious line on a hot-button challenge within the state: the transition to electrical automobiles. She mentioned the definition of the auto business had expanded to incorporate not solely half makers and meeting vegetation, but in addition “battery factories, software program corporations, chip fabs and startups.”

“We don’t care what you drive,” she mentioned to applause. “We simply care that it’s made proper right here in Michigan, by Michigan employees.”