[CentOS] scp with tty

Hello

I need to know a way to have scp allocate a tty on a remote machine
so I can have it run sudo and activate a vpn which it will need to
activate. scp with "-S" does not work. I can't chmod +s the cisco vpn client
because when I try to run it it says it can not have setuser.

I could have the user scp via root but I do not want to do that.

Any way to have scp allocate a tty?