State Sen. Pat Fallon (R-Prosper) announced on Thursday that he will not challenge John Cornyn for his U.S. Senate seat in 2020.

Fallon’s announcement on Thursday came after the Republican legislator recently expressed interest in challenging Cornyn in the Republican primary and went as far as launching an exploratory committee to consider a possible bid. However, Fallon said that considering his family, he chose to pass on the run, but will still work to elect a Republican senator in November 2020.

With Fallon out of the race, two Republicans are left as the announced challengers for Sen. John Cornyn. Dwayne Stovall and Mark Yancey have both launched their primary bids against Cornyn and a number of Democrats have also signed on to run in 2020. Meanwhile, Kerry McKennon is the sole third party candidate with an announced campaign against Cornyn.

Candidates can begin filing for a spot on the ballot next month.