Comprehensive immigration reform isn't going to happen this year, a Democratic senator said over the weekend.

Sen. Jeff MerkleyJeffrey (Jeff) Alan MerkleyDem senator: Trump border policy 'designed to traumatize these kids' Senate Dems urge Trump to continue nuclear arms control negotiations after treaty suspension How to reform the federal electric vehicle tax credit MORE (D-Ore.) said he didn't expect a comprehensive bill to make its way through Congress, which returns in September for several weeks of work before breaking again for midterm elections.

The freshman senator said he was working with Sen. Charles SchumerCharles (Chuck) Ellis SchumerDemocrats must stand up for Israel Retired Gen. McChrystal: Sending troops to build wall could be seen as ‘misuse of power’ ‘It’s called transparency’ works for Trump on TV, not so much on campaign finance MORE (D-N.Y.) on a bill, but didn't expect it to come up during 2010.

"Sen. Schumer and I are working to bring a package to Congress," Merkley told constituents at a town hall meeting, according to the Salem Statesman Journal. "But reform isn't going to happen this year."

Merkley's acknowledgment reflects a growing pessimism among congressional Democrats that they would be able to tackle immigration reform in any meaningful way this year.

Senate Majority Leader Harry ReidHarry Mason ReidManchin’s likely senior role on key energy panel rankles progressives Water wars won’t be won on a battlefield Poll finds most Americans and most women don’t want Pelosi as Speaker MORE (D-Nev.) had said back in April, fresh off Democrats' healthcare victory, that the issue must be handled this year, but has since backed off a pledge to take it up. But by the time the August recess rolled around, Reid had backed off plans to pursue a robust bill, and signaled instead that he might seek a scaled-back bill, like the Dream Act.

The backtracking on immigration comes before an election cycle in which some Republicans might look to use the issue against Democrats, even though Democrats are not entirely united on the issue.

The party did move in recent weeks, though, to make itself seem tougher on immigration, with the Senate coming back to convene a special session to advance a $600 million bill to boost border security that the House had passed in a special session of its own.