...it seems like Ireland (like Israel) has a more special relation ship with USA then UK. So still Brexit need to address GFA in a way that it understands ROI and Catholic NI point of view and not historically UK and NI protestant point of view.
I think that you are right in saying Israel has a more special relationship with the US than the UK. Possibly Ireland, too. While there are clearly pro-Israel and pro-Ireland lobbies in the US, I am unaware of any visible pro-English (UK) lobby.
There is a pro-UK lobby in the US. It’s quiet for two reasons:
1) Expats/diaspora are, by definition, “anywhere’s”. The Irish embrace the “anywhere’s”. Brexiteers/English nationalists don’t. They are “somewheres”. Given that the somewhere/anywhere division is a defining characteristic of Brexit, it’s no real surprise that the UK expats/English diaspora aren’t as vocally supportive of the UK as the Irish expats are of Ireland. Well-educated, professional, mobile - these are predominantly ‘remainer’ characteristics. They’re reluctant to throw their lot in with “somewheres” from, I don’t know, Bishop Auckland who probably view them as not British or patriotic enough.
2. Politicians respond to diasporas. Quiet / ambivalent UK expats/diaspora = disinterested politicians. It’s compounded by the fact that the Dems view Brexit as part of a Trump populist phenomena (thank Farage and Bannon for that) and a good chunk of national security-focused Republicans see ongoing and future tension between the UK and EU as a real threat to “western” cohesion and alliances. For all the principles that Brexit is based on, it’s not lost on anyone that it plays into other unfriendly countries’ hands. The much derided but potential EU defence force, for example, can create problems for NATO, and so on. Outside of the current administration, it’s not clear how many (R) senators and congressmen think gaining the UK but losing the EU is a winning proposition. It isn’t lost on them that they could have had both until Brexiteers decided to shake things up.
The lobby will come back eventually, but even it appears to be okay with watching Brexiteers squirm a bit.
While I don’t disagree with what you say, I think you are understating the extent to which the “Irish Question” is something of an article of faith for the Democratic Party.
In my mind there are three key reasons why the Democrats are so pro-Ireland:
1) I personally believe that history has given Bill Clinton an outsize role in the GFA, Tony Blair and Bertie Ahern were the instrumental leaders IMHO, and Bill mostly just showed up for the photo op. Nonetheless many people, especially in America, believe that he was instrumental in the process, and as much as Bill is persona non grata with the Democrats in the #metoo era (e.g. short speaking slot outside prime time at the convention) the old guard, including Pelosi, Schumer, and Biden, will defend his legacy.
2) The Democratic heartland in the North East is Irish country. To win state-wide elections in states like Massachusetts, Connecticut, and New York the assumption is you have to be pro-Ireland (actually pro-Ireland and pro-Israel, at least in the case of New York).
3) Don’t underestimate the power of the Catholic Church. While this is, admittedly, an uneasy alliance in the 2000s, given the Democrats position on many social issues, the Democrats and the Catholic Church go hand in hand. From Irish migrants, through Italian migrants, and most recently Latino migrants, Catholic demographics in the US have traditionally aligned with the Democratic Party. As I said, this relationship is uneasy, but it is enduring. The Democrats don’t want the Catholic Church espousing from the pulpit that they are against Irish issues. As an aside, Biden is a Catholic descended from Irish migrants.
If the Republicans controlled both houses of Congress and the presidency then I think a deal could be done, but I fully expect that the Democrats will demand some safeguards for the Irish border and Northern Ireland.