President Donald Trump's net approval rating is reported to have improved slightly, according to famed polling expert Nate Silver.

"After crashing at the tail end of the longest government shutdown in US history, Donald Trump’s approval rating has stabilized somewhat. Today, his net approval rating is -13.5, which is about 1.5 points higher than his second term low on November 23rd," Silver wrote in the latest edition of his Silver Bulletin blog published on Sunday (December 7).

Silver said the increase comes from the latest TIPP and InsiderAdvantage polls which had the president at -4 and -5, respectively, which are two of the highest net approval ratings he's had "since at least early November." The polling expert noted, however, that both surveys "have strong Republican house effects, meaning they tend to show Trump with a higher approval rating than the average poll."

Trump was reported to have a -19 net approval rating from YouGov; a -7 rating from Morning Consult and a -15 rating from Bullfinch in recent polls. Last week, CNN chief data analyst Harry Enten reported that the president's approval rating hit a new low for his second term and is approaching exclusive territory.