It s official. Donald Trump is losing Republican support in Congress.As much as they want to believe that continuing to support Trump is in their best interests, Republicans are beginning to realize that they can no longer tolerate his unpresidential behavior.The tipping point was reached on Tuesday when Trump attacked Attorney General Jeff Sessions again on Twitter and demanded that he open an investigation against Hillary Clinton.Ukrainian efforts to sabotage Trump campaign    quietly working to boost Clinton.  So where is the investigation A.G. @seanhannity  Donald J. Trump (@realDonaldTrump) July 25, 2017Attorney General Jeff Sessions has taken a VERY weak position on Hillary Clinton crimes (where are E-mails & DNC server) & Intel leakers!  Donald J. Trump (@realDonaldTrump) July 25, 2017Apparently, Trump thinks that Hillary should be persecuted just because he is being investigated for colluding with Russia during the 2016 Election.Well, Trump s hissy fit did not impress Senator Lindsey Graham, who took to his own Twitter account to rip Trump a new one for his  inappropriate  meddling and obstruction.President Trump s tweet today suggesting Attorney General Sessions pursue prosecution of a former political rival is highly inappropriate. 4  Lindsey Graham (@LindseyGrahamSC) July 25, 2017Prosecutorial decisions should be based on applying facts to the law without hint of political motivation. 5  Lindsey Graham (@LindseyGrahamSC) July 25, 2017To do otherwise is to run away from the long-standing American tradition of separating the law from politics regardless of party. 6  Lindsey Graham (@LindseyGrahamSC) July 25, 2017The past support Trump has received from Republicans is clearly starting to wane. And Trump only has himself to blame because he lacks the ability to keep his mouth shut and exercise self-control. He is literally attacking his own Attorney General, a man who is supported by many Republicans in the Senate.Pennsylvania GOP Rep. Charlie Dent also expressed frustration over Trump s obsessive effort to derail the Russia investigation, telling Morning Joe that Trump s whining is  distracting  and makes it a lot harder for lawmakers to do their jobs.If Trump doesn t stop interfering with the Department of Justice, he will lose more Republican support. At some point, they will wake up and realize that he is hurting their party and America, and once that happens, impeachment will soon follow.Featured image via Shawn Thew-Pool/Getty Images