Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) tweeted Sunday that he prays President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE can be as disciplined in his discourse for the next two months as he was in the last two weeks before his election in 2016.

“My prayer is that our President can be as disciplined in his discourse and speeches like last two [weeks before] his election,” Grassley wrote.

“Then we will be successful in next two months like he was successful,” he added.

@POTUS &@FLOTUS My prayer is that our President can be as disciplined in his discourse and speeches like last two wks b4 his election/Then we will be successful in next two months like he was successful — ChuckGrassley (@ChuckGrassley) September 2, 2018

It is unclear what prompted Grassley's tweet, but Grassley has often implored the president to be more careful in his rhetoric and actions. Grassley earlier this month asked the president to follow Wall Street Journal D.C. bureau chief Gerald Seib’s advice from his Aug. 20 column, where Seib wrote that the president too often steps on his own good news. ADVERTISEMENT

And the senator last week shot back at the president after reports that White House counsel Don McGahn will be leaving in the fall, tweeting to Trump, “U can’t let that happen.”

Republicans like Grassley have expressed concern over the various controversies plaguing the White House as the midterms draw ever closer.

Some controversies involving the president have included his comments at the Helsinki summit with Russian President Vladimir Putin, in which he refused to acknowledge the intelligence community's assessment that Russia meddled in the 2016 elections. The White House was also shaken by the conviction of Trump's former campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, and the plea deal struck by former lawyer Michael Cohen.

Still, some in the GOP say their success during Trump's first two years will outweigh any bad press the administration brings.

When confronted with a Washington Post-ABC News poll where 60 percent of respondents said they disapproved of the president, Sen. Ron Johnson (R-Wis.) said Sunday morning that GOP midterm candidates just needed to emphasize the economic victories the Republicans have won.

"In just the first six quarters of this administration, business investment has increased 7.3 percent on average," Johnson said, as an example of the Republicans success. "The last two years under Obama it only increased 0.6 percent. It's that business investment that I think will lay the foundation for strong economic progress."