WASHINGTON — Sen. Bernie Sanders is traveling to Kentucky, Ohio and Pennsylvania this weekend to rally against the Republican tax bill, his office told NBC News, keeping up a brisk pace of political activity since leaving the presidential race last year and ahead of a potential second one in 2020. Sanders, who held a similar series of rallies across the country this year to oppose the repeal of the Affordable Care Act, is using his "Protecting Working Families Tour" to pressure on-the-fence GOP senators before a vote on the tax bill, President Donald Trump's top legislative priority. Sanders, an independent from Vermont who is up for re-election next year and is considered a possible presidential candidate in 2020, has continued to keep up a campaign-like schedule of events across the country. During the fight over repealing Obamacare, he visited Maine, Kentucky, Nevada, Pennsylvania, Ohio, Michigan, Kansas and West Virginia, including multiple stops to some states. He's also given a series of high-profile policy speeches at places like the Carnegie Endowment for International Peace. Senate Minority Leader Chuck Schumer, D-N.Y., created the position of "Outreach Chairman" for Sanders this year. But the trips also allow Sanders to stay in touch with his loyal national base and nurture connections across the country while working to defend policies he cares about. Sanders has been involved in other efforts against the tax bill, such as leading a recent conference call organized by MoveOn.org that attracted 11,000 callers and thousands more online. In addition to condemning the bill for reducing taxes on the wealthy, Sanders is hoping to use the tour to argue the tax plan would pave the way for cuts to Social Security and Medicare, which have proved politically deadly for Republicans in the past. The bill is expected to raise the deficit by $1.4 trillion, which the nonpartisan Congressional Budget Office recently say could trigger an obscure budget rule that Democrats warn could force Medicare cuts. "This legislation goes well beyond taxes," Sanders wrote in an email that will be sent to supporters Monday. "Mark my words. If passed, the Republicans will then