"We should in a bipartisan way seek to ... change Turkey's behavior," Democratic Representative Eric Swalwell said.
Some 50 U.S. warheads are believed to be deployed at the Incirlik air base in southern Turkey, but reports this weekend suggested officials were reviewing plans for their removal.
Turkey is facing widespread condemnation for its military operation against Kurdish-led forces in northeastern Syria.
"We are voluntarily abdicating our role and it's the Russians, Iranians and others who are benefitting," Richard Haass warned.
General Joseph Dunford said that the new NATO strategy adopted in May was part of the alliance's response to the growing Russian threat.
Anders Fogh Rasmussen told Newsweek that despite Trump's public condemnation, increased U.S. activity has helped the alliance become stronger than it was at the start of the president's term.
Relations between NATO allies the U.S. and Turkey have been strained by Ankara's decision to purchase the Russian-made S-400 anti-aircraft system.
Foreign Minister Sergei Lavrov also warned that proposed NATO expansion poses a threat to peace in Europe.
There are around 150 U.S. nuclear weapons stored in six European countries in what was an open secret but never before publicly discussed.
Turkey's purchase of the Russian anti-aircraft system has opened up a rift with the U.S., which fears the deal could compromise American military secrets.
Russia has long expressed concern that its neighbors could become NATO members and that such developments could spark war.
Ukraine's government has long aspired to join NATO.
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NATO could gain a 30th member by as early as October.
A Fox News panel expressed fears President Donald Trump may inflame "leave" Brexit and anti-NATO sentiment during his U.K. visit.
Despite Norwegian and U.S. denials, the Globus-II radar previously served in a role related to missile technology and was once revealed to be pointing toward Russia.
Washington's demand that Turkey kill a deal for Russia's S-400 anti-aircraft system was "unacceptable," a Kremlin spokesman said.
"During the Cold War, we understood each other's signals. We talked," U.S. Army General Curtis Scaparrotti said. "I'm concerned that we don't know them as well today."
China's rise will demand more U.S. resources, Pence said.
Up to 500 Russian troops have been training in Abkhazia, a breakaway republic claimed by Georgia, which wants to join NATO.
Trump appears to violate social norms "as if he did not care that they exist," the authors of the study said.
President Donald Trump reportedly described the special counsel's probe as "two years of bulls***."
Kremlin spokesperson Dmitry Peskov said "such actions by the United States do not lead to a strengthening of an atmosphere of security and stability in the region."
The Trump administration recently announced that it would pull out of the INF treaty, which was signed between the U.S. and the Soviet Union in 1987.
Both sides of the Atlantic need to face down the challenge from China, and Russia must be given a choice of joining the West or facing China alone.
"Our American colleagues are confident they defeated everything and everyone in the Cold War and can continue to impose their will on European countries like they did before," Pyotr Tolstoy said.