WASHINGTON—Welcoming Angela Merkel to the White House for a final time, President Joe Biden renewed his concerns to the German chancellor Thursday about a major, nearly complete Russia-to-Germany gas pipeline but said they agreed Russia must not be allowed to use energy as a weapon.

The two discussed—though made no apparent headway—on differences over the Nord Stream 2 pipeline during a largely friendly farewell visit for Merkel as she nears the end of a political career that has spanned four American presidencies.

"On a personal note, I must tell you I will miss seeing you at our summits," Biden said as he stood by Merkel, the second-longest serving chancellor in Germany's history, at a late afternoon White House press conference. "I truly will."

Merkel, who had a famously difficult relationship with former President Donald  Trump, showed her ease and familiarity with Biden, who has long been a fixture in international politics, repeatedly referring to him as "Dear Joe."

Asked to compare her relationship with Biden to hers with Trump, Merkel remained diplomatic, saying only that it was in any German chancellor's interest to "work with every American president." She added with a smile, "Today was a very friendly exchange."

But their personal warmth notwithstanding, the US-German relationship is entering new territory as Merkel, who is not seeking another term in September elections, nears her departure from office. There are concerns on both sides about how the two nations will negotiate growing disagreements.

The United States has long argued that the Nord Stream 2 project will threaten European energy security by increasing the continent's reliance on Russian gas and allowing Russia to exert political pressure on vulnerable Eastern and Central European nations, particularly Ukraine. But Biden recently waived sanctions against German entities involved in the project, a move that angered many in Congress.

Sen. Marco Rubio, a Florida Republican, in a letter to Biden on Thursday ahead of the leaders' meeting raised concerns that the pipeline is already having an economic impact on US ally Ukraine. Rubio said Gazprom, the company that operates Nord Stream 2, "has already started to reduce its use of pipelines in Ukraine" as the new gas pipeline nears completion.

Merkel sought to downplay the differences, and to stress that the pipeline was in addition to—not meant to displace—Ukrainian pipelines.

"Our idea is and remains that Ukraine remains a transit country for natural gas, that Ukraine just as any other country in the world has a right to territorial sovereignty," Merkel said. She added that Germany stood ready to react to Moscow "should Russia not respect this right of Ukraine that it has as a transit country."

Merkel also raised concerns about Covid-19 travel restrictions that prevent most Europeans from traveling to the US.

Biden said he had brought in the head of his coronavirus task force to discuss the issue and that he expected to be able to offer a more definitive answer "within the next seven days" about when the restrictions might be eased.

Merkel started her day with a working breakfast with Vice President Kamala Harris, and Harris's office said the two had a "very candid discussion."

Back home in Germany, Merkel's country and neighboring Belgium dealt with the aftermath of heavy flooding  that left more than 60 people dead and dozens missing.

"My sympathy goes to the relatives and of the dead and missing," she said.

Officials in Washington and elsewhere are wondering what course Germany might take after the September vote.

Merkel's Christian Democratic Union is leading in polls, but the environmentalist Greens and the center-left Social Democrats are also vying to lead a future government. While the three parties differ in many policy areas, all are committed to a strong trans-Atlantic relationship.

Germany has strong trade ties with China but has also been critical of Beijing's human-rights record. Merkel is keen to avoid a situation in which Germany, or the European Union, might be forced to choose sides between China and the United States. AP

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