Cucurbits are monoecious; there are separate male and female blossoms on the same plant. The male flowers tend to open first, followed by the female flowers. It is only when both the male and female flowers are open that pollination can occur.
There is nowhere in the Constitution that says that the Congress can subpoena the President of the U.S. or his people. Congress does however have general subpoena powers, but they are not absolutely clear. There are Supreme Court cases that speak to this. They generally limit this to national security type of issues.
Answer Wiki. No. The President is subject to the impeachment power of Congress. He has no authority to overturn it at all in any way, and any president who was impeached by the House and convicted by the Senate would cease to be President, immediately losing all Constitutional authority. The president has no power over the process or the outcome.