My H1B expires in Nov, and I am applying for a renewal.?
You can travel outside the country with the stamp already on your passport until it expires (which in your case is November). After that, until you are flagpoling you would need to get a stamp on your passport (assuming your renewal is approved in time) to return to the US. If your renewal petition is not approved by November, it is recommended that you dont travel outside the US on your expired H1-B stamp. Having traveled several times outside the US in the past year under similar circumstances, I can say that the current political climate has little effect as long as you have all your papers in order. It is important to remember nothing has changed with regards to working and traveling on the H1-B, political climate notwithstanding.