Second Trip on B1 Visa

[dbazone]

Hi,

I have a valid multiple entry B1 visa on which I traveled 3 years back.

The same client is asking me to visit their NY office again for 4 weeks.

My question is do I need to ask the invitation letter again from the client.

Thanks
-Vijay

[cafeconleche]

It would be good to show proof of why you are going to the US, in case you are asked for it at the border.