Oh no, there's a difference here. Tip was the House Speaker in the Reagan years, he had actual control of the House, a result of his leadership of the side who won the most seats in an election.

Kushner has never won an election. His only qualifying trait is the fact that he is married to the President's daughter.

I would expect that Jeffries would talk with the White House from time to time. But if Jeffries were a smart politician, he would publicly point out how he had to go to the President's son-in-law to get anything done, and let people realize how bonkers that is. Alas, Jeffries has proven to be not so smart.

This is so wildly naive I cannot tell if you are joking or not.

I'm going to give you the benefit of the doubt and assume you are still learning about this topic, instead of a troll. Jared Kushner does not hold a government position. He serves as an outside adviser and informal envoy, assisting with foreign policy and negotiations without holding a formal cabinet position. Jeffries talking to Kushner has nothing to do with wanting or having a functional government. Any influence Kushner has in the world is through his association with the Trump brand and his/Trump's money.

After leaving the White House, Jared Kushner started a private equity firm named Affinity Partners. The Public Investment Fund (PIF) of Saudi Arabia invested $2 billion into this firm. Kushner's firm has collected over $110 million in management fees from the Saudi government and other Middle Eastern sovereign wealth funds, even before producing major investment profits for them.

So, if Kushner is unofficially advising Trump/The white house, this really looks like Saudi Arabia is bribing Kushner for access via a bullshit investment into Kushner's company. Furthermore, Iran is not on good terms with Saudi Arabia. So if you're thinking Jeffries is using Kushner's relationship with the Saudis to leverage ceasefire with Iran. That's the least likely outcome. The Saudi's would rather we keep up the conflict with Iran.

Kushner, (and Trump,) are corrupt as fuck. Nothing good will come of Jeffries talking with Kushner. There are other avenues for Jeffries to speak with the president and participate in foreign policy. This just makes Jeffries look super corrupt and complicit with the trump administration.

But Jefferies won his primary, he has the mandate of his district.

The only reason why he won his primary is because the person running against him didn't get financial support from DSA the way other candidates did. The DSA thought it would be too costly to try and oust Jefferies, so they focused on other primaries that were more winnable. If anything, this might piss off enough democrats in his district that they vote against him for a republican, or just don't vote period. I honestly think that this will be one of the nails in the coffin of Jefferies political career.