The rally also comes the day after Trump claimed "profound vindication" following the Supreme Court's ruling upholding his controversial travel ban.
Heitkamp says she also talked about worldwide trade, oil prices and health care-related issues with the president.
On Wednesday, Supreme Court Justice Anthony Kennedy announced he is retiring - allowing Trump to appoint his second justice.
In a 70-minute speech to a raucously supportive crowd, with thousands wearing red "Make America Great Again" caps and waving blue "Drain The Swamp" and "Keep America Great" signs, Cramer received several minutes to make his case and Trump gave him a handful of shout-outs.
"With Washington so divided, Heidi is a rare senator who doesn't get bogged down by partisan politics - she knows both sides of the aisle have good ideas", Libby Schneider, Heitkamp's campaign manager wrote in a statement accompanying the ad, "Heidi brings small-town North Dakota common sense to the Senate, and that's why she's been successful getting real results for the folks she serves".
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But, barring some announcement for a North Dakota visit shortly, this sure looks like a snub.
Trump has tweeted his support for Cramer, who he personally asked to run for the Senate.
"We got more money, we got more brains, we got better houses, apartments, we got nicer boats, we're smarter than they are ... we're the elite!" he said. "Maybe because of this she'll be forced to vote yes".
Trump is scheduled to appear at a rally Wednesday evening in a 6,000-seat Fargo hockey arena in a burst of campaign appearances that has included Nevada, Minnesota and SC. He labeled Heitkamp a "liberal" and tried to tie her to Senate Minority Leader Charles E. Schumer and House Minority Leader Nancy Pelosi.
But Heitkamp, one of the most vulnerable incumbents seeking re-election this year, is considered a moderate who is one of the least reliably partisan Democratic votes in the Senate.
"In all of our policies, we want to make that really clear, we're fighting for working families and people across the state", Rich said before Trump's speech.
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"And on these very important North Dakota values, you'll never have to wonder where I'll be", he said.
Can you imagine if I said the things she said?
Trump said he has to name someone young enough "that's going to be there for 45 years".
He said the increasingly leftward movement of the Democratic Party was making it harder for them to realize their goal of taking control of the House and Senate in November.
"They say Trump is starting a trade war", he said.
Randy Richards is a farmer in Hope, North Dakota.
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