Leftists? Bush II let in as many moslems as Obama did. Both let in around 900,000 (that they admit to). After 9/11 he let the Saudis fly home, called them a religion of peace and increased Saudi immigration 18 fold. Who can forget him walking in Texas holding hands with the Saudi King? And Clinton let in the flood of Somalis. But let’s not forget, the US intervention in Somalia was started but GHW Bush.
Trump slobbers all over the Saudis as much as Obama did. And who can forget that idiotic sword dance he did with them?
And Abbott in Texas and Rick Perry rolled out the welcome carpet to the moslems. Demonrat New Mexico next door is a little Palestine right beside Texas.
The flood of moslems into America is quite bipartisan. It’s a globalist project, and both left and right are gleeful participants, trying hard to cash in.
While it wouldn't be accurate to call Bush a leftist, it would be equally inaccurate to call him a conservative. His closest advisors were neocons, who have always been immigration liberals.
And on the issue of "fighting radical Islam", they seem to have multiple personality disorder - their ideology says "bomb them in their countries", but then any effort to keep their immigrants and refugees out of our country or out of Europe is met with cries of "racist...xenophobe..." etc.
They're also remarkably single-sided in what Islamists they oppose. They're against Iran and its proxies, primarily because Iran's proxies are immediate enemies and threats to Israel, but see nothing wrong with installing a former Al Quaeda fighter as President of Syria, despite the fact that Al Quaeda (unlike Iran or its proxies) has murdered Americans on US soil.