In the 2020 primary, Arredondo-Lynch faced eight intra-party rivals, including fellow conservative Sharon Breckenridge Thomas (born November 14, 1960), a San Antonio attorney who carried the endorsement of the Pastors PAC, which had endorsed Arredondo-Lynch in the 2018 congressional race.<ref>{{cite web|url=http://pastorspac.org/endorsements-mar-2020-primary-rep/|title=Endorsements – March 2020 Primary – Republican|publisher=San Antonio Pastors PAC|accessdate=February 24, 2020}}</ref> Thomas finished with 2,500 votes (6.1 percent).
A pending runoff election will pit Tony Gonzales of San Antonio, who led the primary with 11,530 unofficial votes (28.1 percent) against Raul Reyes, who jumped into an early lead but finished in second place with 9,570 votes (23.4 percent). Arrendondo-Lynch finished third with 5,404 votes (13.2 percent), half in raw votes of what she had received in a two-candidate race in 2018 against Hurd; Jeff McFarlin fourth with 4,240 votes (10.3 percent); Ben Van Winkle, fifth with 4,424 (10.8 percent). Reyes' platform stances are nearly identical to those of Arredondo-Lynch and Sharon Thomas, according to their campaign brochures. A native of the border city of Del Rio, Reyes served for twenty-two years as a lieutenant colonel in the United States Army in which he was assigned to Central and South America. Tony Gonzales of San Antonio, a twenty-year veteran of the [[United States Navy]] carries the endorsement of the two previous and the current representative for District 23 (Henry Bonilla, [[Francisco Canseco]], and Will Hurd), along with Texas Agriculture Commissioner [[Sid Miller]], Land Commissioner George P. Bush, and former San Antonio City Council member and unsuccessful mayoral candidate in 2019, Greg Brockhouse.<ref>{{cite web|url=https://www.ksat.com/news/politics/2020/01/06/this-is-the-2020-republican-march-primary-ballot-for-bexar-county/|title=This is the 2020 Republican March Primary ballot for Bexar County|publisher=ksat.com|accessdate=February 18, 2020}}</ref> Gonzales or Reyes will face the Democrat Gina Ortiz Jones of San Antonio, in the November 3 general election. Ortiz Jones polled 41,560 votes in the Democratic primary against four opponents, having finished with two-thirds of the 62,346 votes cast. The Republican primary turnout was just under 41,000 ballots, some 22,000 less than the total Democratic vote. The tabulations seem to indicate that Ortiz Jones will be the favorite to claim the seat from the Republicans in the fall campaign.
Arredondo-Lynch frequently opens her ranch to the public on special occasions, such as [[Thanksgiving Day]]. She encourages those without families to come visit for a few hours and to enjoy a meal. She also hosted a gathering after the 2018 primary election attended by her die-hard supporters.