Iraqi Lawmakers Vote In Favor Of Removing All Foreign Forces

The transcript discusses the aftermath of a US airstrike ordered by President Trump, which killed Iran's top military commander in Iraq. This led to Iraq's Prime Minister calling it a political assassination and proposing a resolution to end the US military presence in Iraq. The resolution passed in Parliament, but was boycotted by Sunni and Kurdish legislators who support US troops. The vote is nonbinding until signed by the Prime Minister.

Why did some lawmakers boycott the vote on the resolution?

What is required for the vote to be official according to the text?