President Trump on Monday attacked Jeff Sessions, his attorney general, over the Justice Department’s decision to bring criminal charges against two Republican congressmen ahead of the midterm elections, linking the department’s actions with his party’s political fate.

In a series of Twitter posts on Monday, the president also railed against Europe’s immigration issues, especially in Germany, as his own policies come under enhanced scrutiny and criticism.

It was unclear whether the president’s tweets represented any change in his immigration policy, or were just the sort of venting he is known to  do after reading a newspaper article or seeing a television program. The president, who spent much of his holiday weekend golfing with supporters and watching television, was apparently reacting to a “Fox and Friends” segment on immigration that had aired minutes before.

Jared Kushner, the president’s son-in-law and senior adviser, has been  stripped of his high-level security clearance after months of delays in  completing an exhaustive background check, limiting his ability to view highly classified information, a White House official and another person  familiar with Mr. Kushner’s situation said.