Countless former GOP leaders and sitting members of Congress are refusing to support their nominee for president.

What these Republicans fail to mention while they are bashing Trump is that they essentially endorsed Donald Trump long before he was running for president. By failing to carry out the many campaign promises they made, Republican voters were forced to turn to another kind of leader.

In spring 2010, the Affordable Care Act, dubbed Obamacare, was signed into law. For the next eight months, everyday people worked extremely hard to campaign and send Republicans to Washington in order to repeal and replace Obamacare.

In November, the GOP gained over 60 seats and regained control of the House. For eight long months, Republican voters listened to politicians tell them that if they volunteered for their campaigns and donated money to them, they would head to Washington and rip up the new healthcare law.

The Republican House was unable to deliver on its campaign promises.

Meanwhile, President Obama was having little difficulty delivering on his campaign promises, despite his party not having control of the House. Conservatives across the country continued to believe the champions that they sent to Washington. Everyday people were told that if they donated more of their valuable time and money, the Republicans could take control of the Senate in 2014. Once again the people delivered and gave their beloved political party control of both chambers of Congress. Surely President Obama’s outrageous policies would be stopped, right?

Wrong.

In 2015, Congress passed a $1.8 trillion spending bill. Once again, the very people who worked so hard to elect “conservative” politicians were lied to and let down. Despite all the talk from Republican members of Congress about defunding Planned Parenthood, ending sanctuary cities, deporting immigrants who entered the country illegally and reigning in out-of-control spending, conservatives across the country were left with absolutely nothing to show for their hard work.

Republicans feel betrayed, lied to and let down. The candidates who made promises to them for years turned out to be slimy career politicians who were unwilling to stick their necks out for their constituents. Donald Trump is playing off people’s anger and distrust of politicians.

The very Republican lawmakers who refuse to endorse their nominee for president are directly responsible for Trump’s success. It’s time for Republican leaders to get on the Trump Train; otherwise their time in Washington will be short-lived.