The Ides of Trump
Forgive me if this has already been posted. I only heard about it today, and I think it's a great idea for the next big protest. I have started sharing with friends.
https://www.facebook.com/TheIdesOfTrump/
"On March 15th, each of us will mail the White House a postcard that publicly expresses our vocal opposition to the new president. And we, in vast numbers, from all corners of the world, will overwhelm Washington with the President’s unpopularity and our negative opinions of his agenda. We will show the man, the media, and the politicians how vast our numbers are and we will bury the White House post office in pink slips, all informing the President that he’s fired. ...
....HOW TO PARTICIPATE:
1. Write one postcard. Write a dozen! Create your own cards, buy them, share them, it doesn’t matter as long as you write #TheIdes or #TheIdesOfTrump on them somewhere.
2. Take a picture of your cards and post them on social media (tagged with #TheIdesOfTrump or #TheIdes, please). This will help us verify our numbers.
3. Spread the word! Everyone on Earth can let Washington know their opinion of the President. They can’t build a wall high enough to stop the mail.
4. Then, on March 15th, mail your cards to:
The President (for now)
The White House
1600 Pennsylvania Avenue NW
Washington, DC 20500
5. Get ready for the NEXT postcard campaign, and the next, and the next — because we’re not going away. We will make ourselves heard by joining together. And together, we will wield the kind of political clout that can’t be ignored.
THE ONLY RULE IS NO VIOLENCE, THREATS OF VIOLENCE, OR INSINUATIONS OF VIOLENCE. This is about being heard, via postcards. We understand that the ides of March has a history, but that's not what we are — in ANY WAY — calling for here."
= new reply since forum marked as read
I bought some cards on https://www.theidesoftrump.net and donated to Planned Parenthood. This way I won't forget to go to the mailbox. 
You can cut them from to size from cereal boxes or anything that conforms to USPS specifications.
Standard Postcard Sizes: Postage and Requirements
Standard Postcard Specification Chart
34¢ postage required
Postcards . . . . . . . Minimum . . . . Maximum
Postcard Length 5? . . . . . . . . . . .6?
Postcard Height 3½? . . . . . . . . . . 4¼ ?
Paper Thickness 0.007? . . . . . 0.016?
Re-purpose and Recycle is a good idea! For instance you could use boxes from
Diapers
Maxi-pads
Tampons
Taco shells
Mexican rice mix
Anything with Arabic writing he might think looks "Muslim-y"
Feminine Douche
Enemas
Toilet products
Septic treatment
Tucks
Hair Coloring (preferred color goooooold, lol)
Be creative 
