The sources said that a grand jury has been issuing subpoenas, as the investigation is kicking into high gear. Despite this, however, the sources said this is not an indication that any criminal charges are forthcoming against anyone.
The probe is now under the leadership of special counsel Robert Mueller, although it’s unclear if the heightened activity is the result of Mueller taking the helm.
In addition to the unnamed White House official, the investigation is still focusing on people like Michael Flynn and Paul Manafort, who were once connected to the Trump camp but are no longer connected to the President.