Robert Smullen ended his campaign for New York's 21st Congressional District on Friday, declining to appear on the Conservative Party ballot line in November, days after meeting with President Donald Trump in the Oval Office.

The State Assembly member's exit from the race clears the way for a general election matchup between Republican nominee Anthony Constantino and Democrat Blake Gendebien for the seat being vacated by Rep. Elise Stefanik, R-N.Y.

Smullen had faced a Friday deadline to file paperwork with the state Board of Elections, declining the Conservative Party ballot line he had secured declining the Conservative line he had secured for November.

He lost the June 23 Republican primary to Constantino by a margin of roughly 58% to 39%, according to unofficial New York State Board of Elections returns.

Constantino, founder and chief executive of Amsterdam-based Sticker Mule, largely funded his own campaign and received Trump's endorsement in April, defeating a candidate who carried the backing of the state Republican and Conservative parties and a majority of the district's county GOP committees.

Smullen, whose State Assembly term expires at year's end, said in a statement that he discussed alternative paths for public service with Trump and remained confident in the president's approach to keeping the district in Republican hands.

"I am deeply honored to have met with President Trump," Smullen said.

New York Conservative Party Chair Gerard Kassar said he had spoken with Smullen on Wednesday night, when Smullen had not yet decided whether to stay in the race. Kassar said the party could nominate a replacement or leave the ballot line blank now that Smullen has withdrawn.

Constantino thanked his former rival in a statement, saying, "It was a hard-fought campaign that sharpened my skills," and credited the primary fight with generating Republican enthusiasm heading into November.

Gendebien, a St. Lawrence County dairy farmer, defeated restaurant owner Stuart Amoriell in the Democratic primary by roughly 65% to 35% and will face Constantino on Nov. 3 for the seat Stefanik has held since 2015.

Gendebien's campaign said in a statement that voters now have a clear choice, citing Constantino's decision to lay off dozens of Sticker Mule employees and automate those positions, and pointed to Gendebien's focus on cutting costs and protecting healthcare for residents of rural areas.