a) US President Obama is using Congress to pass laws to make gun control stronger.
b) US President Obama has made gun control stronger.
c) US President Obama is using special powers to make gun control stronger.

Đây là định nghĩa các từ có thể giúp bạn khi nghe:
background checks (checks on the things a person has done in their past): kiểm tra lý lịch, kiểm tra về quá khứ của một ai đó
bypass (to go around something in order to avoid it): bỏ qua, tránh một cái gì đó, đi đường vòng
executive order (an order given by the president or the governor of a state in the US which is like a law): sắc lệnh (của Tổng thống hay Thống đốc bang, gần như một điều luật)

Sau đây là bản tin chính: 
The White House has given details of President Obama's plans to tighten gun controls in the US.
It says all gun sellers will have to be registered and must carry out background checks on buyers.
After years of fierce opposition, President Obama has decided to bypass Congress and introduce the measures through a series of executive orders.