Rasmussen has Trump at 39%. Thoughts on why we should not worry:

Rasmussen's Daily Tracking Poll has our President at 39% approval.  The Globalist Press frames this event as "Trump's popularity plummets to new low."  

Plummets. 

Wow.

If memory serves me correctly, the GOP version of a progressive president,  GW Bush, had worse numbers, and,  won re-election with 12 million more votes than he received in 2000  (oh yes he did !!).

Note:  Barack won re-election but with 3.5 million fewer votes than in 2008.

One thing we know for a fact:  traditional "scientific" polling does not necessarily reflect the voting will of the people.  Progressive Republicans and Globalist Democrats want you to forget that absolute fact,  but it is true,  and,  Trump's presidential campaign taught us that lesson.

Keep these points in mind when it comes to negative polling:  (A) There is no provable link between polling numbers and election outcomes.  Polls are often wrong (look at what happened in the special election in Georgia.  No poll predicted a one-sided victory and most polls, two weeks out, had the Democrat winning by a comfortable margin).  (B) Polls almost never get the percentage of victory correct  . .  and "almost never" means 99% of the time.  (C) Most polling surveys weight the poll in favor of the Democrats by as much as 28%.  When you ask 58 Democrats versus 41 Republicans their opinion,  OF COURSE the Democrat wins, and,  this scenario is more than common in the world of propaganda polling. (D) Finally,  most polls do not survey middle, blue collar, hard working, Americans   . . . . . . .   and,  that is Trump's base.  

I do not doubt that President Trump is "under water" when it comes to popularity polling,  but the vast majority of folks who hate the guy,  live in four states  (the West Coast states and New York).  And never forget that outside the single state of California,  Trump won the popular vote by 2 million folks   . . . . .  with negative polling numbers and to the complete surprise of the whiners on the Left.  
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Rasmussen Reports can be found here: 
http://www.rasmussenreports.com/public_content/politics/trump_administration/prez_track_jul31