Foreign policy and national security
Cornyn is hawkish in his foreign policy views.
In December 2010, Cornyn was one of 26 senators to vote against the ratification of New Start, a nuclear arms reduction treaty between the United States and Russia that obliges both countries to have no more than 1,550 strategic warheads and 700 launchers deployed during the next seven years, and provides a continuation of on-site inspections that halted when START I expired the previous year. It was the first arms treaty with Russia in eight years.
In 2013, Cornyn said that, despite the sequester, the Pentagon would actually see its budget increase.
In April 2018, Cornyn was one of eight Republican senators to sign a letter to Treasury Secretary Steven Mnuchin and acting Secretary of State John Sullivan expressing "deep concern" over a United Nations report exposing "North Korean sanctions evasion involving Russia and China" and asserting that the findings "demonstrate an elaborate and alarming military-venture between rogue, tyrannical states to avoid United States and international sanctions and inflict terror and death upon thousands of innocent people" while calling it "imperative that the United States provides a swift and appropriate response to the continued use of chemical weapons used by President Assad and his forces, and works to address the shortcomings in sanctions enforcement".
Cornyn supported U.S. involvement in the Saudi-led intervention in the Yemeni civil war. In December 2018 he said that the U.S. should stand with Saudi Arabia despite the assassination of Jamal Khashoggi, saying: "Saudi Arabia is fighting a proxy war against Iran in Yemen, and an overreaction, in my view, would mean that we cancel arms sales and simply abandon our ally."
As Senate Majority Whip, Cornyn filed a resolution welcoming Israeli Prime Minister Benjamin Netanyahu, who was to address a joint meeting of Congress in March 2015, a resolution co-sponsored only by Republicans. Vice President Biden and numerous Senate and House Democrats said they would not attend the address. Cornyn supported the Senate resolution expressing objection to UN Security Council Resolution 2334, which called Israeli settlement building in the occupied Palestinian territories a flagrant violation of international law.
Cornyn has been a vocal critic of China. In August 2018, Cornyn urged the Trump administration to impose sanctions under the Global Magnitsky Act against Chinese officials responsible for Xinjiang internment camps against the Uyghur Muslim minority in western China's Xinjiang region. In a Washington Post opinion piece, Cornyn wrote that widespread adoption of Huawei technology could increase vulnerability to cyberattacks and endanger NATO troops engaged on 5G-equipped battlefields.
Cornyn heightened his anti-China advocacy during the COVID-19 pandemic and the U.S. withdrawal from Afghanistan. He has been widely accused of spreading the misinformation that MERS (Middle East respiratory syndrome, a disease first reported from the Arabian Peninsula) and the Swine Flu (an epidemic that first emerged in North America) originated from China, because allegedly "people eat bats and snakes and dogs and things like that." In addition to charges of racism, The Washington Post article has noted that "none of the diseases he mentioned are linked to dogs and snakes" and that rattlesnake-eating is not popular in China, but is in Cornyn's own Texas.
Upon the U.S. withdrawal from Afghanistan, Cornyn tweeted that the U.S. still has 30,000 troops in Taiwan (formally the Republic of China); in fact, the U.S. has kept no troops in Taiwan since it normalized relations with China. Cornyn has since deleted the inaccurate tweet and refused to respond to queries about it.
After Russia invaded Ukraine in 2022, Cornyn said Americans had a "responsibility to support the Ukrainian people as they fight to defend their own sovereignty". He advocated sending military aid, but also warned that Russian President Vladimir Putin's unpredictability could escalate the conflict. Cornyn introduced the Ukraine Democracy Defense Lend-Lease Act of 2022 and cosponsored bills that included statements of solidarity with Ukraine, continuing to supply resources to Ukrainian troops, and renewing the Lend-Lease Act after its expiration. His views brought him into conflict with Texas Attorney General Ken Paxton, who criticized him in 2024 for voting for a $95 billion foreign aid package; after Paxton called him an "America Last RINO", Cornyn responded that Paxton should focus on his legal proceedings and "spend less time pushing Russian propaganda".