Every Senate GOP leader voted against the comprehensive immigration reform bill Thursday.

Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGun proposal picks up GOP support Children’s health-care bill faces new obstacles Dems see Trump as potential ally on gun reform MORE (R-Ky.), Senate Minority Whip John CornynJohn CornynGun proposal picks up GOP support House bill set to reignite debate on warrantless surveillance Republicans jockey for position on immigration MORE (R-Texas) and GOP Conference Chairman John ThuneJohn Randolph ThuneGun proposal picks up GOP support Overnight Regulation: Senate panel approves driverless car bill | House bill to change joint-employer rule advances | Treasury to withdraw proposed estate tax rule | Feds delaying Obama methane leak rule Dems see Trump as potential ally on gun reform MORE (S.D.) all said the bill didn’t ensure the border would be secured before illegal immigrants are given a pathway to citizenship.

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McConnell said he was not confident the border security measures in the bill would actually prevent illegal immigration.

“There’s just no way I can look my constituents in the eye and tell them that today’s assurances won’t become tomorrow’s disappointments,” McConnell said on the Senate floor Thursday morning.

Opponents of the bill have repeatedly noted that a previous immigration bill in the 1980s, which also offered a pathway to citizenship, failed on its promise to secure the border.

The current bill includes new funding for border agents and fencing, but critics said the additional expenditures weren’t enough.

“I come here to speak on the pending immigration bill more in disappointment than in anger because of the lost opportunity we had here in the Senate,” Cornyn said. “There is something fundamentally wrong with the idea that if you throw enough money at the problem it will miraculously be solved.”

GOP leaders argued the new bill repeats the mistakes of the last major immigration reform in 1986 by granting “legalization before border security.”

“If you can’t be reasonably certain that the border is secure as a condition of legalization, there’s just no way to be sure that millions more won’t follow the illegal immigrants who are already here,” McConnell said.

Conference Vice Chairman Roy BluntRoy Dean BluntThe Hill's Whip List: Republicans try again on ObamaCare repeal Another health funding cliff puts care for millions at risk Top Senate Dem: We're going forward with understanding we can work with White House on DACA MORE (R-Mo.) also voted against the bill, S. 744.