U.S. Attorney John Durham is under pressure to wrap up his investigation into the origins of the Russia probe by the end of the summer, but if he doesn’t, he could wait to reveal his findings or initiate prosecutions until after the 2020 presidential election, Fox News has learned.

Two sources familiar with Durham’s investigation told Fox News this week that Durham is working expeditiously to try to finish the probe by the end of summer, but that several lines of investigation are not yet complete.

“He believes it’s critical to do them,” one source said. “He is feeling more pressure to get this done and wrapped up.”

The source also told Fox News that Durham “does not want this to be viewed political,” and the closer it gets to November, Durham could “punt it to after the election.”