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"You see congressional approval ratings at 10 percent, 9, 13 percent, whatever. First of all — that's too high," he said. "It's impossible to convey the dysfunction of Washington, D.C."

Johnson spoke to a packed kickoff luncheon for the three-day Faith and Freedom Conference, hosted by the socially conservative Faith and Freedom Coalition.

Only 10 percent of Americans polled in the most recent Gallup survey said they have confidence in Congress, the lowest level on record and a number that puts Congress last in a list of 16 public institutions in terms of public confidence.

Congressional approval was down to 9 percent among Republicans in April, when only 13 percent of Americans overall approved of the legislative body.

Johnson added that what surprised him about the approval rating is the fact that "at least a majority [of Americans] continue to elect politicians that are dedicated to growing this place," despite dissatisfaction with the government.

Johnson joined fellow GOP Sens. Marco RubioMarco Antonio RubioGOP Senate candidates trade barbs in brutal Indiana primary Students gather outside White House after walkout to protest gun violence Overnight Energy: Senate confirms Bridenstine as NASA chief | Watchdog probes Pruitt’s use of security detail | Emails shine light on EPA science policy changes MORE (Fla.), Rand PaulRandal (Rand) Howard PaulGOP senator: Democratic opposition to Pompeo 'driven 100 percent by politics' Pompeo lacks votes for positive vote on panel CIA declassifies memo on nominee's handling of interrogation tapes MORE (Ky.) and Mike LeeMichael (Mike) Shumway LeeSenate confirms Trump’s pick to lead NASA Key senators warn Trump of North Korea effort on Syria Rep. Jordan: Action in Syria ‘should be debated in Congress’ MORE (Utah) in speaking at the luncheon on Thursday.