Lynch supports requiring photo identification and proof of U.S. citizenship for federal elections, banning ballot harvesting, eliminating unsecured ballot drop boxes, ending mass unsolicited mail-in voting, restoring in-person voting as the national standard, and requiring transparent election audits and chain-of-custody procedures.

Lynch calls for aggressive audits of federal agencies, including the Department of Defense, closing loopholes that enable fraud in federal programs, opposing omnibus spending bills, supporting a Balanced Budget Amendment, eliminating redundant agencies, and prohibiting members of Congress from using public office for personal financial gain.

Mark Lynch advocates for securing the southern border, completing the border wall, detaining and deporting illegal immigrants, ending birthright citizenship for children of illegal immigrants, requiring nationwide E-Verify, eliminating federal funding for sanctuary cities, ending chain migration and the diversity visa lottery, and stopping abuse of H-1B and OPT visa programs. He also supports pausing immigration when necessary to protect wages and security.

“We can't allow Iran to have a nuclear weapon. Having said that, it's time to bring our men and women home, to get them out of harm's way.” (August 3 debate)

Would not commit to supporting John Thune as Senate Republican leader — “Absolutely not” — citing Thune's unwillingness to change Senate rules to pass the SAVE Act. (August 4 debate)

“It is a pain point for South Carolinians. We're tired of waking up and seeing 100 acres of trees bulldozed, and we're told the data center is going to go right next to our neighborhood. It is horrible noise pollution.” (August 3 debate) At the August 4 debate he called data centers “a threat to our neighborhoods.”

Lynch prioritizes funding for veterans' healthcare, housing, and services before making new foreign commitments, and advocates for increasing access to healthcare, mental health treatment, housing, and transition services for veterans.

Lynch opposes hostile foreign nations, particularly the Chinese Communist Party, purchasing American farmland and strategic assets, and supports holding China accountable for economic espionage and unfair trade practices.

Lynch advocates for banning hostile foreign governments from purchasing American farmland, protecting family farms from excessive regulation, rebuilding domestic manufacturing, bringing critical pharmaceutical production back to the U.S., expanding American steel and energy production, and using federal procurement to prioritize American-made products.

Lynch supports increasing federal penalties for organized rioting, looting, arson, and destruction of property, providing resources to law enforcement without federal mandates, targeting violent cartels and traffickers, opposing efforts to defund or abolish police, and defending victims' rights.

Lynch supports federal legislation recognizing and protecting life from conception, opposes all federal funding for abortion, supports making Hyde Amendment protections permanent, protecting infants who survive attempted abortions, expanding adoption services and pregnancy resource centers, and protecting conscience rights of healthcare providers.

Asked whether the next senator's job is to support President Trump, Lynch said yes, noting he has voted for Trump every time he has been on the ballot, and added “iron sharpens iron” — disagreement can be productive. (August 3 debate)

Lynch supports enforcing Title IX according to biological sex, prohibiting biological males from competing in women's sports in federally funded programs, protecting privacy in sex-separated spaces, affirming parental rights in education and healthcare decisions, and opposing federal mandates that replace biological sex with subjective gender identity.

Lynch opposes federal vaccine mandates, vaccine passports, and centralized medical tracking systems. He supports informed consent, transparency about vaccine risks, and protecting the doctor-patient relationship from political interference. He also opposes dangerous human experimentation and federal censorship of medical debate.

Lynch opposes all new federal gun control legislation, supports nationwide constitutional carry reciprocity, repealing the National Firearms Act, opposing red flag laws and firearm confiscation programs, and protecting lawful private transfers and ownership.

Lynch supports a Balanced Budget Amendment to the Constitution, opposes deficit spending, and advocates for cutting nonessential federal programs, eliminating wasteful spending, and requiring transparent line-item accountability. He also opposes omnibus spending bills and supports enforceable spending caps.