It is posted on the White House blog as legit.
Yes it is on the White House website that is paid for by taxpayer money.
Why do you think that they need your EMAIL ADDRESS just to view the petitions?
Once they have your email address they will put it on their list. You’ll start getting solicitations for $$$. They will put your email onto the DNC list and hound you. They will cross check your name and email against IRS and FEC records to see what you’ve been donating in the past.