Can we Indian's mail to White-house USA?

you can but I would not recommend it. President Trump may decide to start bombing India too.

Make sure you have the correct address (with postal code) & postage, & it will get there. Whether it will be seen by him or responded to is doubtful.

why not email him

>Can we Indian's mail to White-house USA?

Sure but just tossing it in the trash before you send it is the most cost effective way to get your message to the right people.

>I would like to bring some notice to Mr.Trump.

Well then you better print it on $1000 dollar bills or 24k gold plates.

>Will be seen by the concerned officials or will it be thrown into a trash?

Both, the concerned official will see the envelope is from some nobody from a foreign country and they will tell a subordinate to send you a form letter thanking you for wasting their time and shred the original.

There must be thousands of messages sent to the White House every day from all over the world. Unless your letter is sent by some high Indian Government official, I doubt Trump would ever read it. There are only so many hours in a day.

Anything sent to the White House, whether by paper mail or by e-mail on the president's website, will be filtered according to the general topic addressed by the mail, and then usually answered by a form letter sent out by staff, outlining Trump's views on the topic you addressed.