Step 1: Background.
The Constituent Assembly of India was responsible for framing the Constitution and adopting national symbols. The national flag was one of the key symbols to be officially adopted.
Step 2: Presentation of the proposal.
On 22nd July 1947, Jawaharlal Nehru presented the resolution for adopting the tricolour as the National Flag of independent India in the Constituent Assembly. The flag had saffron, white, and green colours with the Ashoka Chakra in the centre.
Step 3: Conclusion.
Thus, the proposal for the National Flag was presented by Jawaharlal Nehru.
\[
\boxed{\text{Jawaharlal Nehru}}
\]